bootstrap-fileinput/js/fileinput.js

/*!
 * bootstrap-fileinput v4.3.7
 * http://plugins.krajee.com/file-input
 *
 * Author: Kartik Visweswaran
 * Copyright: 2014 - 2017, Kartik Visweswaran, Krajee.com
 *
 * Licensed under the BSD 3-Clause
 * https://github.com/kartik-v/bootstrap-fileinput/blob/master/LICENSE.md
 */
(function (factory) {
    "use strict";
    //noinspection JSUnresolvedVariable
    if (typeof define === 'function' && define.amd) { // jshint ignore:line
        // AMD. Register as an anonymous module.
        define(['jquery'], factory); // jshint ignore:line
    } else { // noinspection JSUnresolvedVariable
        if (typeof module === 'object' && module.exports) { // jshint ignore:line
            // Node/CommonJS
            // noinspection JSUnresolvedVariable
            module.exports = factory(require('jquery')); // jshint ignore:line
        } else {
            // Browser globals
            factory(window.jQuery);
        }
    }
}(function ($) {
    "use strict";

    $.fn.fileinputLocales = {};
    $.fn.fileinputThemes = {};

    var NAMESPACE, MODAL_ID, FRAMES, SORT_CSS, STYLE_SETTING, OBJECT_PARAMS, DEFAULT_PREVIEW, objUrl, compare, handler,
        isIE, previewCache, getNum, hasFileAPISupport, hasDragDropSupport, hasFileUploadSupport, addCss, tMain1, tMain2,
        tPreview, tFileIcon, tClose, tCaption, tBtnDefault, tBtnLink, tBtnBrowse, tModalMain, tModal, tProgress, tSize,
        tFooter, tActions, tActionDelete, tActionUpload, tActionZoom, tActionDrag, tTagBef, tTagBef1, tTagBef2, tTagAft,
        tGeneric, tHtml, tImage, tText, tVideo, tAudio, tFlash, tObject, tPdf, tOther, defaultFileActionSettings,
        defaultLayoutTemplates, defaultPreviewTemplates, defaultPreviewZoomSettings, defaultPreviewTypes, getElement,
        defaultPreviewSettings, defaultFileTypeSettings, isEmpty, isArray, ifSet, uniqId, htmlEncode, replaceTags,
        cleanMemory, findFileName, checkFullScreen, toggleFullScreen, moveArray, FileInput;

    NAMESPACE = '.fileinput';
    MODAL_ID = 'kvFileinputModal';
    FRAMES = '.kv-preview-thumb';
    SORT_CSS = 'file-sortable';
    STYLE_SETTING = 'style="width:{width};height:{height};"';
    OBJECT_PARAMS = '<param name="controller" value="true" />\n' +
        '<param name="allowFullScreen" value="true" />\n' +
        '<param name="allowScriptAccess" value="always" />\n' +
        '<param name="autoPlay" value="false" />\n' +
        '<param name="autoStart" value="false" />\n' +
        '<param name="quality" value="high" />\n';
    DEFAULT_PREVIEW = '<div class="file-preview-other">\n' +
        '<span class="{previewFileIconClass}">{previewFileIcon}</span>\n' +
        '</div>';
    //noinspection JSUnresolvedVariable
    objUrl = window.URL || window.webkitURL;
    compare = function (input, str, exact) {
        return input !== undefined && (exact ? input === str : input.match(str));
    };
    isIE = function (ver) {
        // check for IE versions < 11
        if (navigator.appName !== 'Microsoft Internet Explorer') {
            return false;
        }
        if (ver === 10) {
            return new RegExp('msie\\s' + ver, 'i').test(navigator.userAgent);
        }
        var div = document.createElement("div"), status;
        div.innerHTML = "<!--[if IE " + ver + "]> <i></i> <![endif]-->";
        status = div.getElementsByTagName("i").length;
        document.body.appendChild(div);
        div.parentNode.removeChild(div);
        return status;
    };
    handler = function ($el, event, callback, skipNS) {
        var ev = skipNS ? event : event.split(' ').join(NAMESPACE + ' ') + NAMESPACE;
        if ($el.length) {
            $el.off(ev).on(ev, callback);
        }
    };
    previewCache = {
        data: {},
        init: function (obj) {
            var content = obj.initialPreview, id = obj.id;
            if (content.length > 0 && !isArray(content)) {
                content = content.split(obj.initialPreviewDelimiter);
            }
            previewCache.data[id] = {
                content: content,
                config: obj.initialPreviewConfig,
                tags: obj.initialPreviewThumbTags,
                delimiter: obj.initialPreviewDelimiter,
                previewFileType: obj.initialPreviewFileType,
                previewAsData: obj.initialPreviewAsData,
                template: obj.previewGenericTemplate,
                showZoom: obj.fileActionSettings.showZoom,
                showDrag: obj.fileActionSettings.showDrag,
                getSize: function (size) {
                    return obj._getSize(size);
                },
                parseTemplate: function (cat, data, fname, ftype, pId, ftr, ind, fc, tmpl) {
                    fc = ' file-preview-initial ' + SORT_CSS + (fc ? ' ' + fc : '');
                    return obj._generatePreviewTemplate(cat, data, fname, ftype, pId, false, null, fc, ftr, ind, tmpl);
                },
                msg: function (n) {
                    return obj._getMsgSelected(n);
                },
                initId: obj.previewInitId,
                footer: obj._getLayoutTemplate('footer').replace(/\{progress}/g, obj._renderThumbProgress()),
                isDelete: obj.initialPreviewShowDelete,
                caption: obj.initialCaption,
                actions: function (showUpload, showDelete, showZoom, showDrag, disabled, url, key) {
                    return obj._renderFileActions(showUpload, showDelete, showZoom, showDrag, disabled, url, key, true);
                }
            };
        },
        fetch: function (id) {
            return previewCache.data[id].content.filter(function (n) {
                return n !== null;
            });
        },
        count: function (id, all) {
            return !!previewCache.data[id] && !!previewCache.data[id].content ?
                (all ? previewCache.data[id].content.length : previewCache.fetch(id).length) : 0;
        },
        get: function (id, i, isDisabled) {
            var ind = 'init_' + i, data = previewCache.data[id], config = data.config[i], content = data.content[i],
                previewId = data.initId + '-' + ind, out, $tmp, cat, ftr, fname, ftype, frameClass,
                asData = ifSet('previewAsData', config, data.previewAsData);
            isDisabled = isDisabled === undefined ? true : isDisabled;
            if (!content) {
                return '';
            }
            cat = ifSet('type', config, data.previewFileType || 'generic');
            fname = ifSet('filename', config, ifSet('caption', config));
            ftype = ifSet('filetype', config, cat);
            ftr = previewCache.footer(id, i, isDisabled, (config && config.size || null));
            frameClass = ifSet('frameClass', config);
            if (asData) {
                out = data.parseTemplate(cat, content, fname, ftype, previewId, ftr, ind, frameClass);
            } else {
                out = data.parseTemplate('generic', content, fname, ftype, previewId, ftr, ind, frameClass, cat)
                    .replace(/\{content}/g, data.content[i]);
            }
            if (data.tags.length && data.tags[i]) {
                out = replaceTags(out, data.tags[i]);
            }
            /** @namespace config.frameAttr */
            if (!isEmpty(config) && !isEmpty(config.frameAttr)) {
                $tmp = $(document.createElement('div')).html(out);
                $tmp.find('.file-preview-initial').attr(config.frameAttr);
                out = $tmp.html();
                $tmp.remove();
            }
            return out;
        },
        add: function (id, content, config, tags, append) {
            var data = $.extend(true, {}, previewCache.data[id]), index;
            if (!isArray(content)) {
                content = content.split(data.delimiter);
            }
            if (append) {
                index = data.content.push(content) - 1;
                data.config[index] = config;
                data.tags[index] = tags;
            } else {
                index = content.length - 1;
                data.content = content;
                data.config = config;
                data.tags = tags;
            }
            previewCache.data[id] = data;
            return index;
        },
        set: function (id, content, config, tags, append) {
            var data = $.extend(true, {}, previewCache.data[id]), i, chk;
            if (!content || !content.length) {
                return;
            }
            if (!isArray(content)) {
                content = content.split(data.delimiter);
            }
            chk = content.filter(function (n) {
                return n !== null;
            });
            if (!chk.length) {
                return;
            }
            if (data.content === undefined) {
                data.content = [];
            }
            if (data.config === undefined) {
                data.config = [];
            }
            if (data.tags === undefined) {
                data.tags = [];
            }
            if (append) {
                for (i = 0; i < content.length; i++) {
                    if (content[i]) {
                        data.content.push(content[i]);
                    }
                }
                for (i = 0; i < config.length; i++) {
                    if (config[i]) {
                        data.config.push(config[i]);
                    }
                }
                for (i = 0; i < tags.length; i++) {
                    if (tags[i]) {
                        data.tags.push(tags[i]);
                    }
                }
            } else {
                data.content = content;
                data.config = config;
                data.tags = tags;
            }
            previewCache.data[id] = data;
        },
        unset: function (obj, index) {
            var chk = previewCache.count(obj.id);
            if (!chk) {
                return;
            }
            if (chk === 1) {
                previewCache.data[obj.id].content = [];
                previewCache.data[obj.id].config = [];
                previewCache.data[obj.id].tags = [];
                obj.initialPreview = [];
                obj.initialPreviewConfig = [];
                obj.initialPreviewThumbTags = [];
                return;
            }

            previewCache.data[obj.id].content[index] = null;
            previewCache.data[obj.id].config[index] = null;
            previewCache.data[obj.id].tags[index] = null;
        },
        out: function (id) {
            var html = '', data = previewCache.data[id], caption, len = previewCache.count(id, true);
            if (len === 0) {
                return {content: '', caption: ''};
            }
            for (var i = 0; i < len; i++) {
                html += previewCache.get(id, i);
            }
            caption = data.msg(previewCache.count(id));
            return {content: html, caption: caption};
        },
        footer: function (id, i, isDisabled, size) {
            var data = previewCache.data[id];
            isDisabled = isDisabled === undefined ? true : isDisabled;
            if (!data || !data.config || data.config.length === 0 || isEmpty(data.config[i])) {
                return '';
            }
            var config = data.config[i], caption = ifSet('caption', config), width = ifSet('width', config, 'auto'),
                url = ifSet('url', config, false), key = ifSet('key', config, null),
                showDel = ifSet('showDelete', config, true), showZoom = ifSet('showZoom', config, data.showZoom),
                showDrag = ifSet('showDrag', config, data.showDrag), disabled = (url === false) && isDisabled,
                actions = data.isDelete ? data.actions(false, showDel, showZoom, showDrag, disabled, url, key) : '',
                footer = data.footer.replace(/\{actions}/g, actions);
            return footer.replace(/\{caption}/g, caption).replace(/\{size}/g, data.getSize(size))
                .replace(/\{width}/g, width).replace(/\{indicator}/g, '').replace(/\{indicatorTitle}/g, '');
        }
    };
    getNum = function (num, def) {
        def = def || 0;
        if (typeof num === "number") {
            return num;
        }
        if (typeof num === "string") {
            num = parseFloat(num);
        }
        return isNaN(num) ? def : num;
    };
    hasFileAPISupport = function () {
        return !!(window.File && window.FileReader);
    };
    hasDragDropSupport = function () {
        var div = document.createElement('div');
        /** @namespace div.draggable */
        /** @namespace div.ondragstart */
        /** @namespace div.ondrop */
        return !isIE(9) && (div.draggable !== undefined || (div.ondragstart !== undefined && div.ondrop !== undefined));
    };
    hasFileUploadSupport = function () {
        return hasFileAPISupport() && window.FormData;
    };
    addCss = function ($el, css) {
        $el.removeClass(css).addClass(css);
    };
    defaultFileActionSettings = {
        showRemove: true,
        showUpload: true,
        showZoom: true,
        showDrag: true,
        removeIcon: '<i class="glyphicon glyphicon-trash text-danger"></i>',
        removeClass: 'btn btn-xs btn-default',
        removeTitle: 'Remove file',
        uploadIcon: '<i class="glyphicon glyphicon-upload text-info"></i>',
        uploadClass: 'btn btn-xs btn-default',
        uploadTitle: 'Upload file',
        zoomIcon: '<i class="glyphicon glyphicon-zoom-in"></i>',
        zoomClass: 'btn btn-xs btn-default',
        zoomTitle: 'View Details',
        dragIcon: '<i class="glyphicon glyphicon-menu-hamburger"></i>',
        dragClass: 'text-info',
        dragTitle: 'Move / Rearrange',
        dragSettings: {},
        indicatorNew: '<i class="glyphicon glyphicon-hand-down text-warning"></i>',
        indicatorSuccess: '<i class="glyphicon glyphicon-ok-sign text-success"></i>',
        indicatorError: '<i class="glyphicon glyphicon-exclamation-sign text-danger"></i>',
        indicatorLoading: '<i class="glyphicon glyphicon-hand-up text-muted"></i>',
        indicatorNewTitle: 'Not uploaded yet',
        indicatorSuccessTitle: 'Uploaded',
        indicatorErrorTitle: 'Upload Error',
        indicatorLoadingTitle: 'Uploading ...'
    };
    tMain1 = '{preview}\n' +
        '<div class="kv-upload-progress hide"></div>\n' +
        '<div class="input-group {class}">\n' +
        '   {caption}\n' +
        '   <div class="input-group-btn">\n' +
        '       {remove}\n' +
        '       {cancel}\n' +
        '       {upload}\n' +
        '       {browse}\n' +
        '   </div>\n' +
        '</div>';
    tMain2 = '{preview}\n<div class="kv-upload-progress hide"></div>\n{remove}\n{cancel}\n{upload}\n{browse}\n';
    tPreview = '<div class="file-preview {class}">\n' +
        '    {close}' +
        '    <div class="{dropClass}">\n' +
        '    <div class="file-preview-thumbnails">\n' +
        '    </div>\n' +
        '    <div class="clearfix"></div>' +
        '    <div class="file-preview-status text-center text-success"></div>\n' +
        '    <div class="kv-fileinput-error"></div>\n' +
        '    </div>\n' +
        '</div>';
    tClose = '<div class="close fileinput-remove">&times;</div>\n';
    tFileIcon = '<i class="glyphicon glyphicon-file kv-caption-icon"></i>';
    tCaption = '<div tabindex="500" class="form-control file-caption {class}">\n' +
        '   <div class="file-caption-name"></div>\n' +
        '</div>\n';
    //noinspection HtmlUnknownAttribute
    tBtnDefault = '<button type="{type}" tabindex="500" title="{title}" class="{css}" {status}>{icon} {label}</button>';
    //noinspection HtmlUnknownAttribute
    tBtnLink = '<a href="{href}" tabindex="500" title="{title}" class="{css}" {status}>{icon} {label}</a>';
    //noinspection HtmlUnknownAttribute
    tBtnBrowse = '<div tabindex="500" class="{css}" {status}>{icon} {label}</div>';
    tModalMain = '<div id="' + MODAL_ID + '" class="file-zoom-dialog modal fade" tabindex="-1" aria-labelledby="' +
        MODAL_ID + 'Label"></div>';
    tModal = '<div class="modal-dialog modal-lg" role="document">\n' +
        '  <div class="modal-content">\n' +
        '    <div class="modal-header">\n' +
        '      <div class="kv-zoom-actions pull-right">{toggleheader}{fullscreen}{borderless}{close}</div>\n' +
        '      <h3 class="modal-title">{heading} <small><span class="kv-zoom-title"></span></small></h3>\n' +
        '    </div>\n' +
        '    <div class="modal-body">\n' +
        '      <div class="floating-buttons"></div>\n' +
        '      <div class="kv-zoom-body file-zoom-content"></div>\n' + '{prev} {next}\n' +
        '    </div>\n' +
        '  </div>\n' +
        '</div>\n';
    tProgress = '<div class="progress">\n' +
        '    <div class="{class}" role="progressbar"' +
        ' aria-valuenow="{percent}" aria-valuemin="0" aria-valuemax="100" style="width:{percent}%;">\n' +
        '        {percent}%\n' +
        '     </div>\n' +
        '</div>';
    tSize = ' <samp>({sizeText})</samp>';
    tFooter = '<div class="file-thumbnail-footer">\n' +
        '    <div class="file-footer-caption" title="{caption}">{caption}<br>{size}</div>\n' +
        '    {progress} {actions}\n' +
        '</div>';
    tActions = '<div class="file-actions">\n' +
        '    <div class="file-footer-buttons">\n' +
        '        {upload} {delete} {zoom} {other}' +
        '    </div>\n' +
        '    {drag}\n' +
        '    <div class="file-upload-indicator" title="{indicatorTitle}">{indicator}</div>\n' +
        '    <div class="clearfix"></div>\n' +
        '</div>';
    //noinspection HtmlUnknownAttribute
    tActionDelete = '<button type="button" class="kv-file-remove {removeClass}" ' + 'title="{removeTitle}" {dataUrl}{dataKey}>{removeIcon}</button>\n';
    tActionUpload = '<button type="button" class="kv-file-upload {uploadClass}" title="{uploadTitle}">' +
        '{uploadIcon}</button>';
    tActionZoom = '<button type="button" class="kv-file-zoom {zoomClass}" title="{zoomTitle}">{zoomIcon}</button>';
    tActionDrag = '<span class="file-drag-handle {dragClass}" title="{dragTitle}">{dragIcon}</span>';
    tTagBef = '<div class="file-preview-frame{frameClass}" id="{previewId}" data-fileindex="{fileindex}"' +
        ' data-template="{template}"';
    tTagBef1 = tTagBef + '><div class="kv-file-content">\n';
    tTagBef2 = tTagBef + ' title="{caption}" ' + STYLE_SETTING + '><div class="kv-file-content">\n';
    tTagAft = '</div>{footer}\n</div>\n';
    tGeneric = '{content}\n';
    tHtml = '<div class="kv-preview-data file-preview-html" title="{caption}" ' + STYLE_SETTING + '>{data}</div>\n';
    tImage = '<img src="{data}" class="kv-preview-data file-preview-image" title="{caption}" alt="{caption}" ' +
        STYLE_SETTING + '>\n';
    tText = '<textarea class="kv-preview-data file-preview-text" title="{caption}" readonly ' + STYLE_SETTING +
        '>{data}</textarea>\n';
    tVideo = '<video class="kv-preview-data" width="{width}" height="{height}" controls>\n' +
        '<source src="{data}" type="{type}">\n' + DEFAULT_PREVIEW + '\n</video>\n';
    tAudio = '<audio class="kv-preview-data" controls>\n<source src="' + '{data}' + '" type="{type}">\n' +
        DEFAULT_PREVIEW + '\n</audio>\n';
    tFlash = '<object class="kv-preview-data file-object" type="application/x-shockwave-flash" ' +
        'width="{width}" height="{height}" data="{data}">\n' + OBJECT_PARAMS + ' ' + DEFAULT_PREVIEW + '\n</object>\n';
    tObject = '<object class="kv-preview-data file-object" data="{data}" type="{type}" width="{width}" height="{height}">\n' +
        '<param name="movie" value="{caption}" />\n' + OBJECT_PARAMS + ' ' + DEFAULT_PREVIEW + '\n</object>\n';
    tPdf = '<embed class="kv-preview-data" src="{data}" width="{width}" height="{height}" type="application/pdf">\n';
    tOther = '<div class="kv-preview-data file-preview-other-frame">\n' + DEFAULT_PREVIEW + '\n</div>\n';
    defaultLayoutTemplates = {
        main1: tMain1,
        main2: tMain2,
        preview: tPreview,
        close: tClose,
        fileIcon: tFileIcon,
        caption: tCaption,
        modalMain: tModalMain,
        modal: tModal,
        progress: tProgress,
        size: tSize,
        footer: tFooter,
        actions: tActions,
        actionDelete: tActionDelete,
        actionUpload: tActionUpload,
        actionZoom: tActionZoom,
        actionDrag: tActionDrag,
        btnDefault: tBtnDefault,
        btnLink: tBtnLink,
        btnBrowse: tBtnBrowse
    };
    defaultPreviewTemplates = {
        generic: tTagBef1 + tGeneric + tTagAft,
        html: tTagBef1 + tHtml + tTagAft,
        image: tTagBef1 + tImage + tTagAft,
        text: tTagBef1 + tText + tTagAft,
        video: tTagBef2 + tVideo + tTagAft,
        audio: tTagBef2 + tAudio + tTagAft,
        flash: tTagBef2 + tFlash + tTagAft,
        object: tTagBef2 + tObject + tTagAft,
        pdf: tTagBef2 + tPdf + tTagAft,
        other: tTagBef2 + tOther + tTagAft
    };
    defaultPreviewTypes = ['image', 'html', 'text', 'video', 'audio', 'flash', 'pdf', 'object'];
    defaultPreviewSettings = {
        image: {width: "auto", height: "160px"},
        html: {width: "213px", height: "160px"},
        text: {width: "213px", height: "160px"},
        video: {width: "213px", height: "160px"},
        audio: {width: "213px", height: "80px"},
        flash: {width: "213px", height: "160px"},
        object: {width: "160px", height: "160px"},
        pdf: {width: "160px", height: "160px"},
        other: {width: "160px", height: "160px"}
    };
    defaultPreviewZoomSettings = {
        image: {width: "auto", height: "auto", 'max-width': "100%", 'max-height': "100%"},
        html: {width: "100%", height: "100%", 'min-height': "480px"},
        text: {width: "100%", height: "100%", 'min-height': "480px"},
        video: {width: "auto", height: "100%", 'max-width': "100%"},
        audio: {width: "100%", height: "30px"},
        flash: {width: "auto", height: "480px"},
        object: {width: "auto", height: "100%", 'min-height': "480px"},
        pdf: {width: "100%", height: "100%", 'min-height': "480px"},
        other: {width: "auto", height: "100%", 'min-height': "480px"}
    };
    defaultFileTypeSettings = {
        image: function (vType, vName) {
            return compare(vType, 'image.*') || compare(vName, /\.(gif|png|jpe?g)$/i);
        },
        html: function (vType, vName) {
            return compare(vType, 'text/html') || compare(vName, /\.(htm|html)$/i);
        },
        text: function (vType, vName) {
            return compare(vType, 'text.*') || compare(vName, /\.(xml|javascript)$/i) ||
                compare(vName, /\.(txt|md|csv|nfo|ini|json|php|js|css)$/i);
        },
        video: function (vType, vName) {
            return compare(vType, 'video.*') && (compare(vType, /(ogg|mp4|mp?g|mov|webm|3gp)$/i) ||
                compare(vName, /\.(og?|mp4|webm|mp?g|mov|3gp)$/i));
        },
        audio: function (vType, vName) {
            return compare(vType, 'audio.*') && (compare(vName, /(ogg|mp3|mp?g|wav)$/i) ||
                compare(vName, /\.(og?|mp3|mp?g|wav)$/i));
        },
        flash: function (vType, vName) {
            return compare(vType, 'application/x-shockwave-flash', true) || compare(vName, /\.(swf)$/i);
        },
        pdf: function (vType, vName) {
            return compare(vType, 'application/pdf', true) || compare(vName, /\.(pdf)$/i);
        },
        object: function () {
            return true;
        },
        other: function () {
            return true;
        }
    };
    isEmpty = function (value, trim) {
        return value === undefined || value === null || value.length === 0 || (trim && $.trim(value) === '');
    };
    isArray = function (a) {
        return Array.isArray(a) || Object.prototype.toString.call(a) === '[object Array]';
    };
    ifSet = function (needle, haystack, def) {
        def = def || '';
        return (haystack && typeof haystack === 'object' && needle in haystack) ? haystack[needle] : def;
    };
    getElement = function (options, param, value) {
        return (isEmpty(options) || isEmpty(options[param])) ? value : $(options[param]);
    };
    uniqId = function () {
        return Math.round(new Date().getTime() + (Math.random() * 100));
    };
    htmlEncode = function (str) {
        return str.replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&apos;');
    };
    replaceTags = function (str, tags) {
        var out = str;
        if (!tags) {
            return out;
        }
        $.each(tags, function (key, value) {
            if (typeof value === "function") {
                value = value();
            }
            out = out.split(key).join(value);
        });
        return out;
    };
    cleanMemory = function ($thumb) {
        var data = $thumb.is('img') ? $thumb.attr('src') : $thumb.find('source').attr('src');
        /** @namespace objUrl.revokeObjectURL */
        objUrl.revokeObjectURL(data);
    };
    findFileName = function (filePath) {
        var sepIndex = filePath.lastIndexOf('/');
        if (sepIndex === -1) {
            sepIndex = filePath.lastIndexOf('\\');
        }
        return filePath.split(filePath.substring(sepIndex, sepIndex + 1)).pop();
    };
    checkFullScreen = function () {
        //noinspection JSUnresolvedVariable
        return document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement ||
            document.msFullscreenElement;
    };
    toggleFullScreen = function (maximize) {
        var doc = document, de = doc.documentElement;
        if (de && maximize && !checkFullScreen()) {
            /** @namespace document.requestFullscreen */
            /** @namespace document.msRequestFullscreen */
            /** @namespace document.mozRequestFullScreen */
            /** @namespace document.webkitRequestFullscreen */
            /** @namespace Element.ALLOW_KEYBOARD_INPUT */
            if (de.requestFullscreen) {
                de.requestFullscreen();
            } else if (de.msRequestFullscreen) {
                de.msRequestFullscreen();
            } else if (de.mozRequestFullScreen) {
                de.mozRequestFullScreen();
            } else if (de.webkitRequestFullscreen) {
                de.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
            }
        } else {
            /** @namespace document.exitFullscreen */
            /** @namespace document.msExitFullscreen */
            /** @namespace document.mozCancelFullScreen */
            /** @namespace document.webkitExitFullscreen */
            if (doc.exitFullscreen) {
                doc.exitFullscreen();
            } else if (doc.msExitFullscreen) {
                doc.msExitFullscreen();
            } else if (doc.mozCancelFullScreen) {
                doc.mozCancelFullScreen();
            } else if (doc.webkitExitFullscreen) {
                doc.webkitExitFullscreen();
            }
        }
    };
    moveArray = function (arr, oldIndex, newIndex) {
        if (newIndex >= arr.length) {
            var k = newIndex - arr.length;
            while ((k--) + 1) {
                arr.push(undefined);
            }
        }
        arr.splice(newIndex, 0, arr.splice(oldIndex, 1)[0]);
        return arr;
    };
    FileInput = function (element, options) {
        var self = this;
        self.$element = $(element);
        if (!self._validate()) {
            return;
        }
        self.isPreviewable = hasFileAPISupport();
        self.isIE9 = isIE(9);
        self.isIE10 = isIE(10);
        if (self.isPreviewable || self.isIE9) {
            self._init(options);
            self._listen();
        } else {
            self.$element.removeClass('file-loading');
        }
    };
    FileInput.prototype = {
        constructor: FileInput,
        _init: function (options) {
            var self = this, $el = self.$element, t;
            $.each(options, function (key, value) {
                switch (key) {
                    case 'minFileCount':
                    case 'maxFileCount':
                    case 'maxFileSize':
                        self[key] = getNum(value);
                        break;
                    default:
                        self[key] = value;
                        break;
                }
            });
            self.fileInputCleared = false;
            self.fileBatchCompleted = true;
            if (!self.isPreviewable) {
                self.showPreview = false;
            }
            if (self.allowedPreviewTypes === undefined) {
                self.allowedPreviewTypes = defaultPreviewTypes;
            }
            self.uploadFileAttr = !isEmpty($el.attr('name')) ? $el.attr('name') : 'file_data';
            self.reader = null;
            self.formdata = {};
            self.clearStack();
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.uploadAsyncCount = 0;
            self.loadedImages = [];
            self.totalImagesCount = 0;
            self.ajaxRequests = [];
            self.isError = false;
            self.ajaxAborted = false;
            self.cancelling = false;
            t = self._getLayoutTemplate('progress');
            self.progressTemplate = t.replace('{class}', self.progressClass);
            self.progressCompleteTemplate = t.replace('{class}', self.progressCompleteClass);
            self.progressErrorTemplate = t.replace('{class}', self.progressErrorClass);
            self.dropZoneEnabled = hasDragDropSupport() && self.dropZoneEnabled;
            self.isDisabled = self.$element.attr('disabled') || self.$element.attr('readonly');
            self.isUploadable = hasFileUploadSupport() && !isEmpty(self.uploadUrl);
            self.isClickable = self.browseOnZoneClick && self.showPreview &&
                (self.isUploadable && self.dropZoneEnabled || !isEmpty(self.defaultPreviewContent));
            self.slug = typeof options.slugCallback === "function" ? options.slugCallback : self._slugDefault;
            self.mainTemplate = self.showCaption ? self._getLayoutTemplate('main1') : self._getLayoutTemplate('main2');
            self.captionTemplate = self._getLayoutTemplate('caption');
            self.previewGenericTemplate = self._getPreviewTemplate('generic');
            if (self.resizeImage && (self.maxImageWidth || self.maxImageHeight)) {
                self.imageCanvas = document.createElement('canvas');
                self.imageCanvasContext = self.imageCanvas.getContext('2d');
            }
            if (isEmpty(self.$element.attr('id'))) {
                self.$element.attr('id', uniqId());
            }
            if (self.$container === undefined) {
                self.$container = self._createContainer();
            } else {
                self._refreshContainer();
            }
            self.$dropZone = self.$container.find('.file-drop-zone');
            self.$progress = self.$container.find('.kv-upload-progress');
            self.$btnUpload = self.$container.find('.fileinput-upload');
            self.$captionContainer = getElement(options, 'elCaptionContainer', self.$container.find('.file-caption'));
            self.$caption = getElement(options, 'elCaptionText', self.$container.find('.file-caption-name'));
            self.$previewContainer = getElement(options, 'elPreviewContainer', self.$container.find('.file-preview'));
            self.$preview = getElement(options, 'elPreviewImage', self.$container.find('.file-preview-thumbnails'));
            self.$previewStatus = getElement(options, 'elPreviewStatus', self.$container.find('.file-preview-status'));
            self.$errorContainer = getElement(options, 'elErrorContainer',
                self.$previewContainer.find('.kv-fileinput-error'));
            if (!isEmpty(self.msgErrorClass)) {
                addCss(self.$errorContainer, self.msgErrorClass);
            }
            self.$errorContainer.hide();
            self.fileActionSettings = $.extend(true, defaultFileActionSettings, options.fileActionSettings);
            self.previewInitId = "preview-" + uniqId();
            self.id = self.$element.attr('id');
            previewCache.init(self);
            self._initPreview(true);
            self._initPreviewActions();
            self.options = options;
            self._setFileDropZoneTitle();
            self.$element.removeClass('file-loading');
            if (self.$element.attr('disabled')) {
                self.disable();
            }
            self._initZoom();
        },
        _log: function (msg) {
            var self = this, id = self.$element.attr('id');
            if (id) {
                msg = '"' + id + '": ' + msg;
            }
            if (typeof window.console.log !== "undefined") {
                window.console.log(msg);
            } else {
                window.alert(msg);
            }
        },
        _validate: function () {
            var self = this, status = self.$element.attr('type') === 'file';
            if (!status) {
                self._log('The input "type" must be set to "file" for initializing the "bootstrap-fileinput" plugin.');
            }
            return status;
        },
        _errorsExist: function () {
            var self = this, $err;
            if (self.$errorContainer.find('li').length) {
                return true;
            }
            $err = $(document.createElement('div')).html(self.$errorContainer.html());
            $err.find('span.kv-error-close').remove();
            $err.find('ul').remove();
            return $.trim($err.text()).length ? true : false;
        },
        _errorHandler: function (evt, caption) {
            var self = this, err = evt.target.error;
            /** @namespace err.NOT_FOUND_ERR */
            /** @namespace err.SECURITY_ERR */
            /** @namespace err.NOT_READABLE_ERR */
            if (err.code === err.NOT_FOUND_ERR) {
                self._showError(self.msgFileNotFound.replace('{name}', caption));
            } else if (err.code === err.SECURITY_ERR) {
                self._showError(self.msgFileSecured.replace('{name}', caption));
            } else if (err.code === err.NOT_READABLE_ERR) {
                self._showError(self.msgFileNotReadable.replace('{name}', caption));
            } else if (err.code === err.ABORT_ERR) {
                self._showError(self.msgFilePreviewAborted.replace('{name}', caption));
            } else {
                self._showError(self.msgFilePreviewError.replace('{name}', caption));
            }
        },
        _addError: function (msg) {
            var self = this, $error = self.$errorContainer;
            if (msg && $error.length) {
                $error.html(self.errorCloseButton + msg);
                handler($error.find('.kv-error-close'), 'click', function () {
                    $error.fadeOut('slow');
                });
            }
        },
        _resetErrors: function (fade) {
            var self = this, $error = self.$errorContainer;
            self.isError = false;
            self.$container.removeClass('has-error');
            $error.html('');
            if (fade) {
                $error.fadeOut('slow');
            } else {
                $error.hide();
            }
        },
        _showFolderError: function (folders) {
            var self = this, $error = self.$errorContainer, msg;
            if (!folders) {
                return;
            }
            msg = self.msgFoldersNotAllowed.replace(/\{n}/g, folders);
            self._addError(msg);
            addCss(self.$container, 'has-error');
            $error.fadeIn(800);
            self._raise('filefoldererror', [folders, msg]);
        },
        _showUploadError: function (msg, params, event) {
            var self = this, $error = self.$errorContainer, ev = event || 'fileuploaderror', e = params && params.id ?
            '<li data-file-id="' + params.id + '">' + msg + '</li>' : '<li>' + msg + '</li>';
            if ($error.find('ul').length === 0) {
                self._addError('<ul>' + e + '</ul>');
            } else {
                $error.find('ul').append(e);
            }
            $error.fadeIn(800);
            self._raise(ev, [params, msg]);
            self.$container.removeClass('file-input-new');
            addCss(self.$container, 'has-error');
            return true;
        },
        _showError: function (msg, params, event) {
            var self = this, $error = self.$errorContainer, ev = event || 'fileerror';
            params = params || {};
            params.reader = self.reader;
            self._addError(msg);
            $error.fadeIn(800);
            self._raise(ev, [params, msg]);
            if (!self.isUploadable) {
                self._clearFileInput();
            }
            self.$container.removeClass('file-input-new');
            addCss(self.$container, 'has-error');
            self.$btnUpload.attr('disabled', true);
            return true;
        },
        _noFilesError: function (params) {
            var self = this, label = self.minFileCount > 1 ? self.filePlural : self.fileSingle,
                msg = self.msgFilesTooLess.replace('{n}', self.minFileCount).replace('{files}', label),
                $error = self.$errorContainer;
            self._addError(msg);
            self.isError = true;
            self._updateFileDetails(0);
            $error.fadeIn(800);
            self._raise('fileerror', [params, msg]);
            self._clearFileInput();
            addCss(self.$container, 'has-error');
        },
        _parseError: function (jqXHR, errorThrown, fileName) {
            /** @namespace jqXHR.responseJSON */
            var self = this, errMsg = $.trim(errorThrown + ''),
                dot = errMsg.slice(-1) === '.' ? '' : '.',
                text = jqXHR.responseJSON !== undefined && jqXHR.responseJSON.error !== undefined ?
                    jqXHR.responseJSON.error : jqXHR.responseText;
            if (self.cancelling && self.msgUploadAborted) {
                errMsg = self.msgUploadAborted;
            }
            if (self.showAjaxErrorDetails && text) {
                text = $.trim(text.replace(/\n\s*\n/g, '\n'));
                text = text.length > 0 ? '<pre>' + text + '</pre>' : '';
                errMsg += dot + text;
            } else {
                errMsg += dot;
            }
            self.cancelling = false;
            return fileName ? '<b>' + fileName + ': </b>' + errMsg : errMsg;
        },
        _parseFileType: function (file) {
            var self = this, isValid, vType, cat, i;
            for (i = 0; i < defaultPreviewTypes.length; i += 1) {
                cat = defaultPreviewTypes[i];
                isValid = ifSet(cat, self.fileTypeSettings, defaultFileTypeSettings[cat]);
                vType = isValid(file.type, file.name) ? cat : '';
                if (!isEmpty(vType)) {
                    return vType;
                }
            }
            return 'other';
        },
        _getPreviewIcon: function (fname) {
            var self = this, ext, out = null;
            if (fname && fname.indexOf('.') > -1) {
                ext = fname.split('.').pop();
                if (self.previewFileIconSettings && self.previewFileIconSettings[ext]) {
                    out = self.previewFileIconSettings[ext];
                }
                if (self.previewFileExtSettings) {
                    $.each(self.previewFileExtSettings, function (key, func) {
                        if (self.previewFileIconSettings[key] && func(ext)) {
                            out = self.previewFileIconSettings[key];
                            //noinspection UnnecessaryReturnStatementJS
                            return;
                        }
                    });
                }
            }
            return out;
        },
        _parseFilePreviewIcon: function (content, fname) {
            var self = this, icn = self._getPreviewIcon(fname) || self.previewFileIcon;
            if (content.indexOf('{previewFileIcon}') > -1) {
                content = content.replace(/\{previewFileIconClass}/g, self.previewFileIconClass).replace(
                    /\{previewFileIcon}/g, icn);
            }
            return content;
        },
        _raise: function (event, params) {
            var self = this, e = $.Event(event);
            if (params !== undefined) {
                self.$element.trigger(e, params);
            } else {
                self.$element.trigger(e);
            }
            if (e.isDefaultPrevented()) {
                return false;
            }
            if (!e.result) {
                return e.result;
            }
            switch (event) {
                // ignore these events
                case 'filebatchuploadcomplete':
                case 'filebatchuploadsuccess':
                case 'fileuploaded':
                case 'fileclear':
                case 'filecleared':
                case 'filereset':
                case 'fileerror':
                case 'filefoldererror':
                case 'fileuploaderror':
                case 'filebatchuploaderror':
                case 'filedeleteerror':
                case 'filecustomerror':
                case 'filesuccessremove':
                    break;
                // receive data response via `filecustomerror` event`
                default:
                    self.ajaxAborted = e.result;
                    break;
            }
            return true;
        },
        _listenFullScreen: function (isFullScreen) {
            var self = this, $modal = self.$modal, $btnFull, $btnBord;
            if (!$modal || !$modal.length) {
                return;
            }
            $btnFull = $modal && $modal.find('.btn-fullscreen');
            $btnBord = $modal && $modal.find('.btn-borderless');
            if (!$btnFull.length || !$btnBord.length) {
                return;
            }
            $btnFull.removeClass('active').attr('aria-pressed', 'false');
            $btnBord.removeClass('active').attr('aria-pressed', 'false');
            if (isFullScreen) {
                $btnFull.addClass('active').attr('aria-pressed', 'true');
            } else {
                $btnBord.addClass('active').attr('aria-pressed', 'true');
            }
            if ($modal.hasClass('file-zoom-fullscreen')) {
                self._maximizeZoomDialog();
            } else {
                if (isFullScreen) {
                    self._maximizeZoomDialog();
                } else {
                    $btnBord.removeClass('active').attr('aria-pressed', 'false');
                }
            }
        },
        _listen: function () {
            var self = this, $el = self.$element, $form = $el.closest('form'), $cont = self.$container;
            handler($el, 'change', $.proxy(self._change, self));
            if (self.showBrowse) {
                handler(self.$btnFile, 'click', $.proxy(self._browse, self));
            }
            handler($form, 'reset', $.proxy(self.reset, self));
            handler($cont.find('.fileinput-remove:not([disabled])'), 'click', $.proxy(self.clear, self));
            handler($cont.find('.fileinput-cancel'), 'click', $.proxy(self.cancel, self));
            self._initDragDrop();
            if (!self.isUploadable) {
                handler($form, 'submit', $.proxy(self._submitForm, self));
            }
            handler(self.$container.find('.fileinput-upload'), 'click', $.proxy(self._uploadClick, self));
            handler($(window), 'resize', function () {
                self._listenFullScreen(screen.width === window.innerWidth && screen.height === window.innerHeight);
            });
            handler($(document), 'webkitfullscreenchange mozfullscreenchange fullscreenchange MSFullscreenChange',
                function () {
                    self._listenFullScreen(checkFullScreen());
                });
            self._initClickable();
        },
        _initClickable: function () {
            var self = this, $zone;
            if (!self.isClickable) {
                return;
            }
            $zone = self.isUploadable ? self.$dropZone : self.$preview.find('.file-default-preview');
            addCss($zone, 'clickable');
            $zone.attr('tabindex', -1);
            handler($zone, 'click', function (e) {
                var $tar = $(e.target);
                if (!$tar.parents('.file-preview-thumbnails').length || $tar.parents('.file-default-preview').length) {
                    self.$element.trigger('click');
                    $zone.blur();
                }
            });
        },
        _initDragDrop: function () {
            var self = this, $zone = self.$dropZone;
            if (self.isUploadable && self.dropZoneEnabled && self.showPreview) {
                handler($zone, 'dragenter dragover', $.proxy(self._zoneDragEnter, self));
                handler($zone, 'dragleave', $.proxy(self._zoneDragLeave, self));
                handler($zone, 'drop', $.proxy(self._zoneDrop, self));
                handler($(document), 'dragenter dragover drop', self._zoneDragDropInit);
            }
        },
        _zoneDragDropInit: function (e) {
            e.stopPropagation();
            e.preventDefault();
        },
        _zoneDragEnter: function (e) {
            var self = this, hasFiles = $.inArray('Files', e.originalEvent.dataTransfer.types) > -1;
            self._zoneDragDropInit(e);
            if (self.isDisabled || !hasFiles) {
                e.originalEvent.dataTransfer.effectAllowed = 'none';
                e.originalEvent.dataTransfer.dropEffect = 'none';
                return;
            }
            addCss(self.$dropZone, 'file-highlighted');
        },
        _zoneDragLeave: function (e) {
            var self = this;
            self._zoneDragDropInit(e);
            if (self.isDisabled) {
                return;
            }
            self.$dropZone.removeClass('file-highlighted');
        },
        _zoneDrop: function (e) {
            var self = this;
            e.preventDefault();
            /** @namespace e.originalEvent.dataTransfer */
            if (self.isDisabled || isEmpty(e.originalEvent.dataTransfer.files)) {
                return;
            }
            self._change(e, 'dragdrop');
            self.$dropZone.removeClass('file-highlighted');
        },
        _uploadClick: function (e) {
            var self = this, $btn = self.$container.find('.fileinput-upload'), $form,
                isEnabled = !$btn.hasClass('disabled') && isEmpty($btn.attr('disabled'));
            if (e && e.isDefaultPrevented()) {
                return;
            }
            if (!self.isUploadable) {
                if (isEnabled && $btn.attr('type') !== 'submit') {
                    $form = $btn.closest('form');
                    // downgrade to normal form submit if possible
                    if ($form.length) {
                        $form.trigger('submit');
                    }
                    e.preventDefault();
                }
                return;
            }
            e.preventDefault();
            if (isEnabled) {
                self.upload();
            }
        },
        _submitForm: function () {
            var self = this, $el = self.$element, files = $el.get(0).files;
            if (files && self.minFileCount > 0 && self._getFileCount(files.length) < self.minFileCount) {
                self._noFilesError({});
                return false;
            }
            return !self._abort({});
        },
        _clearPreview: function () {
            var self = this, $p = self.$preview,
                $thumbs = self.showUploadedThumbs ? $p.find(FRAMES + ':not(.file-preview-success)') : $p.find(FRAMES);
            $thumbs.each(function () {
                var $thumb = $(this), $cache = $p.find('#zoom-' + $thumb.attr('id')).closest('.kv-zoom-cache');
                $thumb.remove();
                $cache.remove();
            });
            if (!self.$preview.find(FRAMES).length || !self.showPreview) {
                self._resetUpload();
            }
            self._validateDefaultPreview();
        },
        _initSortable: function () {
            var self = this, $el = self.$preview, settings, selector = '.' + SORT_CSS;
            if (!window.KvSortable || $el.find(selector).length === 0) {
                return;
            }
            //noinspection JSUnusedGlobalSymbols
            settings = {
                handle: '.drag-handle-init',
                dataIdAttr: 'data-preview-id',
                draggable: selector,
                onSort: function (e) {
                    var oldIndex = e.oldIndex, newIndex = e.newIndex, key, $frame;
                    self.initialPreview = moveArray(self.initialPreview, oldIndex, newIndex);
                    self.initialPreviewConfig = moveArray(self.initialPreviewConfig, oldIndex, newIndex);
                    previewCache.init(self);
                    for (var i = 0; i < self.initialPreviewConfig.length; i++) {
                        if (self.initialPreviewConfig[i] !== null) {
                            key = self.initialPreviewConfig[i].key;
                            $frame = $(".kv-file-remove[data-key='" + key + "']").closest(FRAMES);
                            $frame.attr('data-fileindex', 'init_' + i).data('fileindex', 'init_' + i);
                        }
                    }
                    self._raise('filesorted', {
                        previewId: $(e.item).attr('id'),
                        'oldIndex': oldIndex,
                        'newIndex': newIndex,
                        stack: self.initialPreviewConfig
                    });
                }
            };
            if ($el.data('kvsortable')) {
                $el.kvsortable('destroy');
            }
            $.extend(true, settings, self.fileActionSettings.dragSettings);
            $el.kvsortable(settings);
        },
        _initPreview: function (isInit) {
            var self = this, cap = self.initialCaption || '', out;
            if (!previewCache.count(self.id)) {
                self._clearPreview();
                if (isInit) {
                    self._setCaption(cap);
                } else {
                    self._initCaption();
                }
                return;
            }
            out = previewCache.out(self.id);
            cap = isInit && self.initialCaption ? self.initialCaption : out.caption;
            self.$preview.html(out.content);
            self._setInitThumbAttr();
            self._setCaption(cap);
            self._initSortable();
            if (!isEmpty(out.content)) {
                self.$container.removeClass('file-input-new');
            }
        },
        _getZoomButton: function (type) {
            var self = this, label = self.previewZoomButtonIcons[type], css = self.previewZoomButtonClasses[type],
                title = ' title="' + (self.previewZoomButtonTitles[type] || '') + '" ',
                params = title + (type === 'close' ? ' data-dismiss="modal" aria-hidden="true"' : '');
            if (type === 'fullscreen' || type === 'borderless' || type === 'toggleheader') {
                params += ' data-toggle="button" aria-pressed="false" autocomplete="off"';
            }
            return '<button type="button" class="' + css + ' btn-' + type + '"' + params + '>' + label + '</button>';
        },
        _getModalContent: function () {
            var self = this;
            return self._getLayoutTemplate('modal')
                .replace(/\{heading}/g, self.msgZoomModalHeading)
                .replace(/\{prev}/g, self._getZoomButton('prev'))
                .replace(/\{next}/g, self._getZoomButton('next'))
                .replace(/\{toggleheader}/g, self._getZoomButton('toggleheader'))
                .replace(/\{fullscreen}/g, self._getZoomButton('fullscreen'))
                .replace(/\{borderless}/g, self._getZoomButton('borderless'))
                .replace(/\{close}/g, self._getZoomButton('close'));
        },
        _listenModalEvent: function (event) {
            var self = this, $modal = self.$modal, getParams = function (e) {
                return {
                    sourceEvent: e,
                    previewId: $modal.data('previewId'),
                    modal: $modal
                };
            };
            $modal.on(event + '.bs.modal', function (e) {
                var $btnFull = $modal.find('.btn-fullscreen'), $btnBord = $modal.find('.btn-borderless');
                self._raise('filezoom' + event, getParams(e));
                if (event === 'shown') {
                    $btnBord.removeClass('active').attr('aria-pressed', 'false');
                    $btnFull.removeClass('active').attr('aria-pressed', 'false');
                    if ($modal.hasClass('file-zoom-fullscreen')) {
                        self._maximizeZoomDialog();
                        if (checkFullScreen()) {
                            $btnFull.addClass('active').attr('aria-pressed', 'true');
                        } else {
                            $btnBord.addClass('active').attr('aria-pressed', 'true');
                        }
                    }
                }
            });
        },
        _initZoom: function () {
            var self = this, $dialog, modalMain = self._getLayoutTemplate('modalMain'), modalId = '#' + MODAL_ID;
            self.$modal = $(modalId);
            if (!self.$modal || !self.$modal.length) {
                $dialog = $(document.createElement('div')).html(modalMain).insertAfter(self.$container);
                self.$modal = $('#' + MODAL_ID).insertBefore($dialog);
                $dialog.remove();
            }
            self.$modal.html(self._getModalContent());
            self._listenModalEvent('show');
            self._listenModalEvent('shown');
            self._listenModalEvent('hide');
            self._listenModalEvent('hidden');
            self._listenModalEvent('loaded');
        },
        _initZoomButtons: function () {
            var self = this, previewId = self.$modal.data('previewId') || '', $first, $last, $preview = self.$preview,
                thumbs = $preview.find(FRAMES).toArray(), len = thumbs.length,
                $prev = self.$modal.find('.btn-prev'), $next = self.$modal.find('.btn-next');
            if (thumbs.length < 2) {
                $prev.hide();
                $next.hide();
                return;
            } else {
                $prev.show();
                $next.show();
            }
            if (!len) {
                return;
            }
            $first = $(thumbs[0]);
            $last = $(thumbs[len - 1]);
            $prev.removeAttr('disabled');
            $next.removeAttr('disabled');
            if ($first.length && $first.attr('id') === previewId) {
                $prev.attr('disabled', true);
            }
            if ($last.length && $last.attr('id') === previewId) {
                $next.attr('disabled', true);
            }
        },
        _maximizeZoomDialog: function () {
            var self = this, $modal = self.$modal, $head = $modal.find('.modal-header:visible'),
                $foot = $modal.find('.modal-footer:visible'), $body = $modal.find('.modal-body'),
                h = $(window).height(), diff = 0;
            $modal.addClass('file-zoom-fullscreen');
            if ($head && $head.length) {
                h -= $head.outerHeight(true);
            }
            if ($foot && $foot.length) {
                h -= $foot.outerHeight(true);
            }
            if ($body && $body.length) {
                diff = $body.outerHeight(true) - $body.height();
                h -= diff;
            }
            $modal.find('.kv-zoom-body').height(h);
        },
        _resizeZoomDialog: function (fullScreen) {
            var self = this, $modal = self.$modal, $btnFull = $modal.find('.btn-fullscreen'),
                $btnBord = $modal.find('.btn-borderless');
            if ($modal.hasClass('file-zoom-fullscreen')) {
                toggleFullScreen(false);
                if (!fullScreen) {
                    if (!$btnFull.hasClass('active')) {
                        $modal.removeClass('file-zoom-fullscreen');
                        self.$modal.find('.kv-zoom-body').css('height', self.zoomModalHeight);
                    } else {
                        $btnFull.removeClass('active').attr('aria-pressed', 'false');
                    }
                } else {
                    if (!$btnFull.hasClass('active')) {
                        $modal.removeClass('file-zoom-fullscreen');
                        self._resizeZoomDialog(true);
                        if ($btnBord.hasClass('active')) {
                            $btnBord.removeClass('active').attr('aria-pressed', 'false');
                        }
                    }
                }
            } else {
                if (!fullScreen) {
                    self._maximizeZoomDialog();
                    return;
                }
                toggleFullScreen(true);
            }
            $modal.focus();
        },
        _setZoomContent: function ($frame, animate) {
            var self = this, $content, tmplt, body, title, $body, $dataEl, config, pid = $frame.attr('id'),
                $modal = self.$modal, $prev = $modal.find('.btn-prev'), $next = $modal.find('.btn-next'), $tmp,
                $btnFull = $modal.find('.btn-fullscreen'), $btnBord = $modal.find('.btn-borderless'), cap, size,
                $btnTogh = $modal.find('.btn-toggleheader'), $zoomPreview = self.$preview.find('#zoom-' + pid);
            tmplt = $zoomPreview.attr('data-template') || 'generic';
            $content = $zoomPreview.find('.kv-file-content');
            body = $content.length ? $content.html() : '';
            cap = $frame.data('caption') || '';
            size = $frame.data('size') || '';
            title = cap + ' ' + size;
            $modal.find('.kv-zoom-title').html(title);
            $body = $modal.find('.kv-zoom-body');
            $modal.removeClass('kv-single-content');
            if (animate) {
                $tmp = $body.clone().insertAfter($body);
                $body.html(body).hide();
                $tmp.fadeOut('fast', function () {
                    $body.fadeIn('fast');
                    $tmp.remove();
                });
            } else {
                $body.html(body);
            }
            config = self.previewZoomSettings[tmplt];
            if (config) {
                $dataEl = $body.find('.kv-preview-data');
                addCss($dataEl, 'file-zoom-detail');
                $.each(config, function (key, value) {
                    $dataEl.css(key, value);
                    if (($dataEl.attr('width') && key === 'width') || ($dataEl.attr('height') && key === 'height')) {
                        $dataEl.removeAttr(key);
                    }
                });
            }
            $modal.data('previewId', pid);
            handler($prev, 'click', function () {
                self._zoomSlideShow('prev', pid);
            });
            handler($next, 'click', function () {
                self._zoomSlideShow('next', pid);
            });
            handler($btnFull, 'click', function () {
                self._resizeZoomDialog(true);
            });
            handler($btnBord, 'click', function () {
                self._resizeZoomDialog(false);
            });
            handler($btnTogh, 'click', function () {
                var $header = $modal.find('.modal-header'), $floatBar = $modal.find('.modal-body .floating-buttons'),
                    ht, $actions = $header.find('.kv-zoom-actions'), resize = function (height) {
                        var $body = self.$modal.find('.kv-zoom-body'), h = self.zoomModalHeight;
                        if ($modal.hasClass('file-zoom-fullscreen')) {
                            h = $body.outerHeight(true);
                            if (!height) {
                                h = h - $header.outerHeight(true);
                            }
                        }
                        $body.css('height', height ? h + height : h);
                    };
                if ($header.is(':visible')) {
                    ht = $header.outerHeight(true);
                    $header.slideUp('slow', function () {
                        $actions.find('.btn').appendTo($floatBar);
                        resize(ht);
                    });
                } else {
                    $floatBar.find('.btn').appendTo($actions);
                    $header.slideDown('slow', function () {
                        resize();
                    });
                }
                $modal.focus();
            });
            handler($modal, 'keydown', function (e) {
                var key = e.which || e.keyCode;
                if (key === 37 && !$prev.attr('disabled')) {
                    self._zoomSlideShow('prev', pid);
                }
                if (key === 39 && !$next.attr('disabled')) {
                    self._zoomSlideShow('next', pid);
                }
            });
        },
        _zoomPreview: function ($btn) {
            var self = this, $frame, $body = $('body'), $modal = self.$modal;
            if (!$btn.length) {
                throw 'Cannot zoom to detailed preview!';
            }
            if ($body.length) {
                $modal.appendTo($body);
            }
            $modal.html(self._getModalContent());
            $frame = $btn.closest(FRAMES);
            self._setZoomContent($frame);
            $modal.modal('show');
            self._initZoomButtons();
        },
        _zoomSlideShow: function (dir, previewId) {
            var self = this, $btn = self.$modal.find('.kv-zoom-actions .btn-' + dir), $targFrame, i,
                thumbs = self.$preview.find(FRAMES).toArray(), len = thumbs.length, out;
            if ($btn.attr('disabled')) {
                return;
            }
            for (i = 0; i < len; i++) {
                if ($(thumbs[i]).attr('id') === previewId) {
                    out = dir === 'prev' ? i - 1 : i + 1;
                    break;
                }
            }
            if (out < 0 || out >= len || !thumbs[out]) {
                return;
            }
            $targFrame = $(thumbs[out]);
            if ($targFrame.length) {
                self._setZoomContent($targFrame, true);
            }
            self._initZoomButtons();
            self._raise('filezoom' + dir, {'previewId': previewId, modal: self.$modal});
        },
        _initZoomButton: function () {
            var self = this;
            self.$preview.find('.kv-file-zoom').each(function () {
                var $el = $(this);
                handler($el, 'click', function () {
                    self._zoomPreview($el);
                });
            });
        },
        _initPreviewActions: function () {
            var self = this, $preview = self.$preview, deleteExtraData = self.deleteExtraData || {},
                btnRemove = FRAMES + ' .kv-file-remove',
                resetProgress = function () {
                    var hasFiles = self.isUploadable ? previewCache.count(self.id) : self.$element.get(0).files.length;
                    if ($preview.find(btnRemove).length === 0 && !hasFiles) {
                        self.reset();
                        self.initialCaption = '';
                    }
                };
            self._initZoomButton();
            $preview.find(btnRemove).each(function () {
                var $el = $(this), vUrl = $el.data('url') || self.deleteUrl, vKey = $el.data('key');
                if (isEmpty(vUrl) || vKey === undefined) {
                    return;
                }
                var $frame = $el.closest(FRAMES), cache = previewCache.data[self.id],
                    settings, params, index = $frame.data('fileindex'), config, extraData;
                index = parseInt(index.replace('init_', ''));
                config = isEmpty(cache.config) && isEmpty(cache.config[index]) ? null : cache.config[index];
                extraData = isEmpty(config) || isEmpty(config.extra) ? deleteExtraData : config.extra;
                if (typeof extraData === "function") {
                    extraData = extraData();
                }
                params = {id: $el.attr('id'), key: vKey, extra: extraData};
                settings = $.extend(true, {}, {
                    url: vUrl,
                    type: 'POST',
                    dataType: 'json',
                    data: $.extend(true, {}, {key: vKey}, extraData),
                    beforeSend: function (jqXHR) {
                        self.ajaxAborted = false;
                        self._raise('filepredelete', [vKey, jqXHR, extraData]);
                        if (self.ajaxAborted) {
                            jqXHR.abort();
                        } else {
                            addCss($frame, 'file-uploading');
                            addCss($el, 'disabled');
                        }
                    },
                    success: function (data, textStatus, jqXHR) {
                        var n, cap;
                        if (isEmpty(data) || isEmpty(data.error)) {
                            previewCache.init(self);
                            index = parseInt(($frame.data('fileindex')).replace('init_', ''));
                            previewCache.unset(self, index);
                            n = previewCache.count(self.id);
                            cap = n > 0 ? self._getMsgSelected(n) : '';
                            self._raise('filedeleted', [vKey, jqXHR, extraData]);
                            self._setCaption(cap);
                        } else {
                            params.jqXHR = jqXHR;
                            params.response = data;
                            self._showError(data.error, params, 'filedeleteerror');
                            $frame.removeClass('file-uploading');
                            $el.removeClass('disabled');
                            resetProgress();
                            return;
                        }
                        $frame.removeClass('file-uploading').addClass('file-deleted');
                        $frame.fadeOut('slow', function () {
                            var $zoom = $preview.find('#zoom-' + $frame.attr('id'));
                            if ($zoom.length) {
                                $zoom.closest('.kv-zoom-cache').remove();
                            }
                            self._clearObjects($frame);
                            $frame.remove();
                            resetProgress();
                            if (!n && self.getFileStack().length === 0) {
                                self._setCaption('');
                                self.reset();
                            }
                        });
                    },
                    error: function (jqXHR, textStatus, errorThrown) {
                        var errMsg = self._parseError(jqXHR, errorThrown);
                        params.jqXHR = jqXHR;
                        params.response = {};
                        self._showError(errMsg, params, 'filedeleteerror');
                        $frame.removeClass('file-uploading');
                        resetProgress();
                    }
                }, self.ajaxDeleteSettings);
                handler($el, 'click', function () {
                    if (!self._validateMinCount()) {
                        return false;
                    }
                    $.ajax(settings);
                });
            });
        },
        _clearObjects: function ($el) {
            $el.find('video audio').each(function () {
                this.pause();
                $(this).remove();
            });
            $el.find('img object div').each(function () {
                $(this).remove();
            });
        },
        _clearFileInput: function () {
            var self = this, $el = self.$element, $srcFrm, $tmpFrm, $tmpEl;
            self.fileInputCleared = true;
            if (isEmpty($el.val())) {
                return;
            }
            // Fix for IE ver < 11, that does not clear file inputs. Requires a sequence of steps to prevent IE
            // crashing but still allow clearing of the file input.
            if (self.isIE9 || self.isIE10) {
                $srcFrm = $el.closest('form');
                $tmpFrm = $(document.createElement('form'));
                $tmpEl = $(document.createElement('div'));
                $el.before($tmpEl);
                if ($srcFrm.length) {
                    $srcFrm.after($tmpFrm);
                } else {
                    $tmpEl.after($tmpFrm);
                }
                $tmpFrm.append($el).trigger('reset');
                $tmpEl.before($el).remove();
                $tmpFrm.remove();
            } else { // normal input clear behavior for other sane browsers
                $el.val('');
            }
        },
        _resetUpload: function () {
            var self = this;
            self.uploadCache = {content: [], config: [], tags: [], append: true};
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.uploadAsyncCount = 0;
            self.loadedImages = [];
            self.totalImagesCount = 0;
            self.$btnUpload.removeAttr('disabled');
            self._setProgress(0);
            addCss(self.$progress, 'hide');
            self._resetErrors(false);
            self.ajaxAborted = false;
            self.ajaxRequests = [];
            self._resetCanvas();
            self.cacheInitialPreview = {};
        },
        _resetCanvas: function () {
            var self = this;
            if (self.canvas && self.imageCanvasContext) {
                self.imageCanvasContext.clearRect(0, 0, self.canvas.width, self.canvas.height);
            }
        },
        _hasInitialPreview: function () {
            var self = this;
            return !self.overwriteInitial && previewCache.count(self.id);
        },
        _resetPreview: function () {
            var self = this, out, cap;
            if (previewCache.count(self.id)) {
                out = previewCache.out(self.id);
                self.$preview.html(out.content);
                self._setInitThumbAttr();
                cap = self.initialCaption ? self.initialCaption : out.caption;
                self._setCaption(cap);
            } else {
                self._clearPreview();
                self._initCaption();
            }
            if (self.showPreview) {
                self._initZoom();
                self._initSortable();
            }
        },
        _clearDefaultPreview: function () {
            var self = this;
            self.$preview.find('.file-default-preview').remove();
        },
        _validateDefaultPreview: function () {
            var self = this;
            if (!self.showPreview || isEmpty(self.defaultPreviewContent)) {
                return;
            }
            self.$preview.html('<div class="file-default-preview">' + self.defaultPreviewContent + '</div>');
            self.$container.removeClass('file-input-new');
            self._initClickable();
        },
        _resetPreviewThumbs: function (isAjax) {
            var self = this, out;
            if (isAjax) {
                self._clearPreview();
                self.clearStack();
                return;
            }
            if (self._hasInitialPreview()) {
                out = previewCache.out(self.id);
                self.$preview.html(out.content);
                self._setInitThumbAttr();
                self._setCaption(out.caption);
                self._initPreviewActions();
            } else {
                self._clearPreview();
            }
        },
        _getLayoutTemplate: function (t) {
            var self = this,
                template = ifSet(t, self.layoutTemplates, defaultLayoutTemplates[t]);
            if (isEmpty(self.customLayoutTags)) {
                return template;
            }
            return replaceTags(template, self.customLayoutTags);
        },
        _getPreviewTemplate: function (t) {
            var self = this,
                template = ifSet(t, self.previewTemplates, defaultPreviewTemplates[t]);
            if (isEmpty(self.customPreviewTags)) {
                return template;
            }
            return replaceTags(template, self.customPreviewTags);
        },
        _getOutData: function (jqXHR, responseData, filesData) {
            var self = this;
            jqXHR = jqXHR || {};
            responseData = responseData || {};
            filesData = filesData || self.filestack.slice(0) || {};
            return {
                form: self.formdata,
                files: filesData,
                filenames: self.filenames,
                filescount: self.getFilesCount(),
                extra: self._getExtraData(),
                response: responseData,
                reader: self.reader,
                jqXHR: jqXHR
            };
        },
        _getMsgSelected: function (n) {
            var self = this, strFiles = n === 1 ? self.fileSingle : self.filePlural;
            return n > 0 ? self.msgSelected.replace('{n}', n).replace('{files}', strFiles) : self.msgNoFilesSelected;
        },
        _getThumbs: function (css) {
            css = css || '';
            return this.$preview.find(FRAMES + ':not(.file-preview-initial)' + css);
        },
        _getExtraData: function (previewId, index) {
            var self = this, data = self.uploadExtraData;
            if (typeof self.uploadExtraData === "function") {
                data = self.uploadExtraData(previewId, index);
            }
            return data;
        },
        _initXhr: function (xhrobj, previewId, fileCount) {
            var self = this;
            if (xhrobj.upload) {
                xhrobj.upload.addEventListener('progress', function (event) {
                    var pct = 0, total = event.total, position = event.loaded || event.position;
                    /** @namespace event.lengthComputable */
                    if (event.lengthComputable) {
                        pct = Math.floor(position / total * 100);
                    }
                    if (previewId) {
                        self._setAsyncUploadStatus(previewId, pct, fileCount);
                    } else {
                        self._setProgress(pct);
                    }
                }, false);
            }
            return xhrobj;
        },
        _ajaxSubmit: function (fnBefore, fnSuccess, fnComplete, fnError, previewId, index) {
            var self = this, settings;
            self._raise('filepreajax', [previewId, index]);
            self._uploadExtra(previewId, index);
            settings = $.extend(true, {}, {
                xhr: function () {
                    var xhrobj = $.ajaxSettings.xhr();
                    return self._initXhr(xhrobj, previewId, self.getFileStack().length);
                },
                url: self.uploadUrl,
                type: 'POST',
                dataType: 'json',
                data: self.formdata,
                cache: false,
                processData: false,
                contentType: false,
                beforeSend: fnBefore,
                success: fnSuccess,
                complete: fnComplete,
                error: fnError
            }, self.ajaxSettings);
            self.ajaxRequests.push($.ajax(settings));
        },
        _initUploadSuccess: function (out, $thumb, allFiles) {
            var self = this, append, data, index, $div, $newCache, content, config, tags, i,
                mergeArray = function (prop, content) {
                    if (!(self[prop] instanceof Array)) {
                        self[prop] = [];
                    }
                    if (content && content.length) {
                        self[prop] = self[prop].concat(content);
                    }
                };
            if (!self.showPreview || typeof out !== 'object' || $.isEmptyObject(out)) {
                return;
            }
            if (out.initialPreview !== undefined && out.initialPreview.length > 0) {
                self.hasInitData = true;
                content = out.initialPreview || [];
                config = out.initialPreviewConfig || [];
                tags = out.initialPreviewThumbTags || [];
                append = out.append === undefined || out.append ? true : false;
                if (content.length > 0 && !isArray(content)) {
                    content = content.split(self.initialPreviewDelimiter);
                }
                self.overwriteInitial = false;
                mergeArray('initialPreview', content);
                mergeArray('initialPreviewConfig', config);
                mergeArray('initialPreviewThumbTags', tags);
                if ($thumb !== undefined) {
                    if (!allFiles) {
                        index = previewCache.add(self.id, content, config[0], tags[0], append);
                        data = previewCache.get(self.id, index, false);
                        $div = $(document.createElement('div')).html(data).hide().insertAfter($thumb);
                        $newCache = $div.find('.kv-zoom-cache');
                        if ($newCache && $newCache.length) {
                            $newCache.insertAfter($thumb);
                        }
                        $thumb.fadeOut('slow', function () {
                            var $newThumb = $div.find('.file-preview-frame'),
                                $cache = self.$preview.find('#zoom-' + $thumb.attr('id')).closest('.kv-zoom-cache');
                            if ($newThumb && $newThumb.length) {
                                $newThumb.insertBefore($thumb).fadeIn('slow').css('display:inline-block');
                            }
                            self._initPreviewActions();
                            self._clearFileInput();
                            if ($cache && $cache.length) {
                                $cache.remove();
                            }
                            $thumb.remove();
                            $div.remove();
                            self._initSortable();
                        });
                    } else {
                        i = $thumb.attr('data-fileindex');
                        self.uploadCache.content[i] = content[0];
                        self.uploadCache.config[i] = config[0] || [];
                        self.uploadCache.tags[i] = tags[0] || [];
                        self.uploadCache.append = append;
                    }
                } else {
                    previewCache.set(self.id, content, config, tags, append);
                    self._initPreview();
                    self._initPreviewActions();
                }
            }
        },
        _initSuccessThumbs: function () {
            var self = this;
            if (!self.showPreview) {
                return;
            }
            self._getThumbs(FRAMES + ' .file-preview-success').each(function () {
                var $thumb = $(this), $preview = self.$preview, $remove = $thumb.find('.kv-file-remove');
                $remove.removeAttr('disabled');
                handler($remove, 'click', function () {
                    var id = $thumb.attr('id'), out = self._raise('filesuccessremove', [id, $thumb.data('fileindex')]);
                    cleanMemory($thumb);
                    if (out === false) {
                        return;
                    }
                    $thumb.fadeOut('slow', function () {
                        var $zoom = $preview.find('#zoom-' + id);
                        if ($zoom.length) {
                            $zoom.closest('.kv-zoom-cache').remove();
                        }
                        $thumb.remove();
                        if (!$preview.find(FRAMES).length) {
                            self.reset();
                        }
                    });
                });
            });
        },
        _checkAsyncComplete: function () {
            var self = this, previewId, i;
            for (i = 0; i < self.filestack.length; i++) {
                if (self.filestack[i]) {
                    previewId = self.previewInitId + "-" + i;
                    if ($.inArray(previewId, self.uploadLog) === -1) {
                        return false;
                    }
                }
            }
            return (self.uploadAsyncCount === self.uploadLog.length);
        },
        _uploadExtra: function (previewId, index) {
            var self = this, data = self._getExtraData(previewId, index);
            if (data.length === 0) {
                return;
            }
            $.each(data, function (key, value) {
                self.formdata.append(key, value);
            });
        },
        _uploadSingle: function (i, files, allFiles) {
            var self = this, total = self.getFileStack().length, formdata = new FormData(), outData,
                previewId = self.previewInitId + "-" + i, $thumb, chkComplete, $btnUpload, $btnDelete,
                hasPostData = self.filestack.length > 0 || !$.isEmptyObject(self.uploadExtraData),
                fnBefore, fnSuccess, fnComplete, fnError, updateUploadLog, params = {id: previewId, index: i};
            self.formdata = formdata;
            if (self.showPreview) {
                $thumb = $('#' + previewId + ':not(.file-preview-initial)');
                $btnUpload = $thumb.find('.kv-file-upload');
                $btnDelete = $thumb.find('.kv-file-remove');
                $('#' + previewId).find('.file-thumb-progress').removeClass('hide');
            }
            if (total === 0 || !hasPostData || ($btnUpload && $btnUpload.hasClass('disabled')) || self._abort(params)) {
                return;
            }
            updateUploadLog = function (i, previewId) {
                self.updateStack(i, undefined);
                self.uploadLog.push(previewId);
                if (self._checkAsyncComplete()) {
                    self.fileBatchCompleted = true;
                }
            };
            chkComplete = function () {
                var u = self.uploadCache, $initThumbs, i, j, len, data = self.cacheInitialPreview;
                if (!self.fileBatchCompleted) {
                    return;
                }
                setTimeout(function () {
                    if (self.showPreview) {
                        previewCache.set(self.id, u.content, u.config, u.tags, u.append);
                        len = data && data.content ? data.content.length : 0;
                        if (len) {
                            for (i = 0; i < u.content.length; i++) {
                                j = i + len;
                                data.content[j] = u.content[i];
                                if (data.config.length) {
                                    data.config[j] = u.config[i];
                                }
                                if (data.tags.length) {
                                    data.tags[j] = u.tags[i];
                                }
                            }
                            self.initialPreview = data.content;
                            self.initialPreviewConfig = data.config;
                            self.initialPreviewThumbTags = data.tags;
                        } else {
                            self.initialPreview = u.content;
                            self.initialPreviewConfig = u.config;
                            self.initialPreviewThumbTags = u.tags;
                        }
                        self.cacheInitialPreview = {};
                        if (self.hasInitData) {
                            self._initPreview();
                            self._initPreviewActions();
                        }
                    }
                    self.unlock();
                    self._clearFileInput();
                    $initThumbs = self.$preview.find('.file-preview-initial');
                    if (self.uploadAsync && $initThumbs.length) {
                        addCss($initThumbs, SORT_CSS);
                        self._initSortable();
                    }
                    self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
                    self.uploadCount = 0;
                    self.uploadStatus = {};
                    self.uploadLog = [];
                    self._setProgress(101);
                }, 100);
            };
            fnBefore = function (jqXHR) {
                outData = self._getOutData(jqXHR);
                self.fileBatchCompleted = false;
                if (self.showPreview) {
                    if (!$thumb.hasClass('file-preview-success')) {
                        self._setThumbStatus($thumb, 'Loading');
                        addCss($thumb, 'file-uploading');
                    }
                    $btnUpload.attr('disabled', true);
                    $btnDelete.attr('disabled', true);
                }
                if (!allFiles) {
                    self.lock();
                }
                self._raise('filepreupload', [outData, previewId, i]);
                $.extend(true, params, outData);
                if (self._abort(params)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                var pid = self.showPreview && $thumb.attr('id') ? $thumb.attr('id') : previewId;
                outData = self._getOutData(jqXHR, data);
                $.extend(true, params, outData);
                setTimeout(function () {
                    if (isEmpty(data) || isEmpty(data.error)) {
                        if (self.showPreview) {
                            self._setThumbStatus($thumb, 'Success');
                            $btnUpload.hide();
                            self._initUploadSuccess(data, $thumb, allFiles);
                        }
                        self._raise('fileuploaded', [outData, pid, i]);
                        if (!allFiles) {
                            self.updateStack(i, undefined);
                        } else {
                            updateUploadLog(i, pid);
                        }
                    } else {
                        self._showUploadError(data.error, params);
                        self._setPreviewError($thumb, i);
                        if (allFiles) {
                            updateUploadLog(i, pid);
                        }
                    }
                }, 100);
            };
            fnComplete = function () {
                setTimeout(function () {
                    if (self.showPreview) {
                        $btnUpload.removeAttr('disabled');
                        $btnDelete.removeAttr('disabled');
                        $thumb.removeClass('file-uploading');
                        self._setProgress(101, $('#' + previewId).find('.file-thumb-progress'));
                    }
                    if (!allFiles) {
                        self.unlock(false);
                        self._clearFileInput();
                    } else {
                        chkComplete();
                    }
                    self._initSuccessThumbs();
                }, 100);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var errMsg = self._parseError(jqXHR, errorThrown, (allFiles ? files[i].name : null));
                setTimeout(function () {
                    if (allFiles) {
                        updateUploadLog(i, previewId);
                    }
                    self.uploadStatus[previewId] = 100;
                    self._setPreviewError($thumb, i);
                    $.extend(true, params, self._getOutData(jqXHR));
                    self._showUploadError(errMsg, params);
                }, 100);
            };
            formdata.append(self.uploadFileAttr, files[i], self.filenames[i]);
            formdata.append('file_id', i);
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError, previewId, i);
        },
        _uploadBatch: function () {
            var self = this, files = self.filestack, total = files.length, params = {}, fnBefore, fnSuccess, fnError,
                fnComplete, hasPostData = self.filestack.length > 0 || !$.isEmptyObject(self.uploadExtraData),
                setAllUploaded;
            self.formdata = new FormData();
            if (total === 0 || !hasPostData || self._abort(params)) {
                return;
            }
            setAllUploaded = function () {
                $.each(files, function (key) {
                    self.updateStack(key, undefined);
                });
                self._clearFileInput();
            };
            fnBefore = function (jqXHR) {
                self.lock();
                var outData = self._getOutData(jqXHR);
                if (self.showPreview) {
                    self._getThumbs().each(function () {
                        var $thumb = $(this), $btnUpload = $thumb.find('.kv-file-upload'),
                            $btnDelete = $thumb.find('.kv-file-remove');
                        if (!$thumb.hasClass('file-preview-success')) {
                            self._setThumbStatus($thumb, 'Loading');
                            addCss($thumb, 'file-uploading');
                        }
                        $btnUpload.attr('disabled', true);
                        $btnDelete.attr('disabled', true);
                    });
                }
                self._raise('filebatchpreupload', [outData]);
                if (self._abort(outData)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                /** @namespace data.errorkeys */
                var outData = self._getOutData(jqXHR, data), $thumbs = self._getThumbs(':not(.file-preview-error)'), key = 0,
                    keys = isEmpty(data) || isEmpty(data.errorkeys) ? [] : data.errorkeys;
                if (isEmpty(data) || isEmpty(data.error)) {
                    self._raise('filebatchuploadsuccess', [outData]);
                    setAllUploaded();
                    if (self.showPreview) {
                        $thumbs.each(function () {
                            var $thumb = $(this), $btnUpload = $thumb.find('.kv-file-upload');
                            $thumb.find('.kv-file-upload').hide();
                            self._setThumbStatus($thumb, 'Success');
                            $thumb.removeClass('file-uploading');
                            $btnUpload.removeAttr('disabled');
                        });
                        self._initUploadSuccess(data);
                    } else {
                        self.reset();
                    }
                } else {
                    if (self.showPreview) {
                        $thumbs.each(function () {
                            var $thumb = $(this), $btnDelete = $thumb.find('.kv-file-remove'),
                                $btnUpload = $thumb.find('.kv-file-upload');
                            $thumb.removeClass('file-uploading');
                            $btnUpload.removeAttr('disabled');
                            $btnDelete.removeAttr('disabled');
                            if (keys.length === 0) {
                                self._setPreviewError($thumb);
                                return;
                            }
                            if ($.inArray(key, keys) !== -1) {
                                self._setPreviewError($thumb);
                            } else {
                                $thumb.find('.kv-file-upload').hide();
                                self._setThumbStatus($thumb, 'Success');
                                self.updateStack(key, undefined);
                            }
                            key++;
                        });
                        self._initUploadSuccess(data);
                    }
                    self._showUploadError(data.error, outData, 'filebatchuploaderror');
                }
            };
            fnComplete = function () {
                self._setProgress(101);
                self.unlock();
                self._initSuccessThumbs();
                self._clearFileInput();
                self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var outData = self._getOutData(jqXHR), errMsg = self._parseError(jqXHR, errorThrown);
                self._showUploadError(errMsg, outData, 'filebatchuploaderror');
                self.uploadFileCount = total - 1;
                if (!self.showPreview) {
                    return;
                }
                self._getThumbs().each(function () {
                    var $thumb = $(this), key = $thumb.attr('data-fileindex');
                    $thumb.removeClass('file-uploading');
                    if (self.filestack[key] !== undefined) {
                        self._setPreviewError($thumb);
                    }
                });
                self._getThumbs().removeClass('file-uploading');
                self._getThumbs(' .kv-file-upload').removeAttr('disabled');
                self._getThumbs(' .kv-file-delete').removeAttr('disabled');
            };
            $.each(files, function (key, data) {
                if (!isEmpty(files[key])) {
                    self.formdata.append(self.uploadFileAttr, data, self.filenames[key]);
                }
            });
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError);
        },
        _uploadExtraOnly: function () {
            var self = this, params = {}, fnBefore, fnSuccess, fnComplete, fnError;
            self.formdata = new FormData();
            if (self._abort(params)) {
                return;
            }
            fnBefore = function (jqXHR) {
                self.lock();
                var outData = self._getOutData(jqXHR);
                self._raise('filebatchpreupload', [outData]);
                self._setProgress(50);
                params.data = outData;
                params.xhr = jqXHR;
                if (self._abort(params)) {
                    jqXHR.abort();
                    self._setProgressCancelled();
                }
            };
            fnSuccess = function (data, textStatus, jqXHR) {
                var outData = self._getOutData(jqXHR, data);
                if (isEmpty(data) || isEmpty(data.error)) {
                    self._raise('filebatchuploadsuccess', [outData]);
                    self._clearFileInput();
                    self._initUploadSuccess(data);
                } else {
                    self._showUploadError(data.error, outData, 'filebatchuploaderror');
                }
            };
            fnComplete = function () {
                self._setProgress(101);
                self.unlock();
                self._clearFileInput();
                self._raise('filebatchuploadcomplete', [self.filestack, self._getExtraData()]);
            };
            fnError = function (jqXHR, textStatus, errorThrown) {
                var outData = self._getOutData(jqXHR), errMsg = self._parseError(jqXHR, errorThrown);
                params.data = outData;
                self._showUploadError(errMsg, outData, 'filebatchuploaderror');
            };
            self._ajaxSubmit(fnBefore, fnSuccess, fnComplete, fnError);
        },
        _initFileActions: function () {
            var self = this, $preview = self.$preview;
            if (!self.showPreview) {
                return;
            }
            self._initZoomButton();
            $preview.find(FRAMES + ' .kv-file-remove').each(function () {
                var $el = $(this), $frame = $el.closest(FRAMES), hasError, id = $frame.attr('id'),
                    ind = $frame.attr('data-fileindex'), n, cap, status;
                handler($el, 'click', function () {
                    status = self._raise('filepreremove', [id, ind]);
                    if (status === false || !self._validateMinCount()) {
                        return false;
                    }
                    hasError = $frame.hasClass('file-preview-error');
                    cleanMemory($frame);
                    $frame.fadeOut('slow', function () {
                        var $zoom = $preview.find('#zoom-' + id);
                        if ($zoom.length) {
                            $zoom.closest('.kv-zoom-cache').remove();
                        }
                        self.updateStack(ind, undefined);
                        self._clearObjects($frame);
                        $frame.remove();
                        if (id && hasError) {
                            self.$errorContainer.find('li[data-file-id="' + id + '"]').fadeOut('fast', function () {
                                $(this).remove();
                                if (!self._errorsExist()) {
                                    self._resetErrors();
                                }
                            });
                        }
                        self._clearFileInput();
                        var filestack = self.getFileStack(true), chk = previewCache.count(self.id),
                            len = filestack.length,
                            hasThumb = self.showPreview && $preview.find(FRAMES).length;
                        if (len === 0 && chk === 0 && !hasThumb) {
                            self.reset();
                        } else {
                            n = chk + len;
                            cap = n > 1 ? self._getMsgSelected(n) : (filestack[0] ? self._getFileNames()[0] : '');
                            self._setCaption(cap);
                        }
                        self._raise('fileremoved', [id, ind]);
                    });
                });
            });
            self.$preview.find(FRAMES + ' .kv-file-upload').each(function () {
                var $el = $(this);
                handler($el, 'click', function () {
                    var $frame = $el.closest(FRAMES), ind = $frame.attr('data-fileindex');
                    if (!$frame.hasClass('file-preview-error')) {
                        self._uploadSingle(ind, self.filestack, false);
                    }
                });
            });
        },
        _hideFileIcon: function () {
            if (this.overwriteInitial) {
                this.$captionContainer.find('.kv-caption-icon').hide();
            }
        },
        _showFileIcon: function () {
            this.$captionContainer.find('.kv-caption-icon').show();
        },
        _getSize: function (bytes) {
            var self = this, size = parseFloat(bytes), i, func = self.fileSizeGetter, sizes, out;
            if (!$.isNumeric(bytes) || !$.isNumeric(size)) {
                return '';
            }
            if (typeof func === 'function') {
                out = func(size);
            } else {
                i = Math.floor(Math.log(size) / Math.log(1024));
                sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
                out = (size / Math.pow(1024, i)).toFixed(2) * 1 + ' ' + sizes[i];
            }
            return self._getLayoutTemplate('size').replace('{sizeText}', out);
        },
        _generatePreviewTemplate: function (cat, data, fname, ftype, previewId, isError, size, frameClass, foot, ind, templ) {
            var self = this, caption = self.slug(fname),
                config = ifSet(cat, self.previewSettings, defaultPreviewSettings[cat]), prevContent, zoomContent = '',
                footer = foot || self._renderFileFooter(caption, size, config.width, isError),
                hasIconSetting = self._getPreviewIcon(fname),
                forcePrevIcon = hasIconSetting && self.preferIconicPreview,
                forceZoomIcon = hasIconSetting && self.preferIconicZoomPreview,
                getContent = function (c, d, zoom, frameCss) {
                    var id = zoom ? 'zoom-' + previewId : previewId, tmplt = self._getPreviewTemplate(c),
                        css = (frameClass || '') + ' ' + frameCss;
                    if (zoom) {
                        css = css.replace(' ' + SORT_CSS, '');
                    }
                    tmplt = self._parseFilePreviewIcon(tmplt, fname);
                    if (c === 'text') {
                        d = htmlEncode(d);
                    }
                    return tmplt.replace(/\{previewId}/g, id).replace(/\{caption}/g, caption)
                        .replace(/\{frameClass}/g, css).replace(/\{type}/g, ftype).replace(/\{fileindex}/g, ind)
                        .replace(/\{width}/g, config.width).replace(/\{height}/g, config.height)
                        .replace(/\{footer}/g, footer).replace(/\{data}/g, d).replace(/\{template}/g, templ || cat);
                };
            ind = ind || previewId.slice(previewId.lastIndexOf('-') + 1);
            if (self.fileActionSettings.showZoom) {
                zoomContent = getContent((forceZoomIcon ? 'other' : cat), data, true, 'kv-zoom-thumb');
            }
            zoomContent = '\n<div class="kv-zoom-cache" style="display:none">\n' + zoomContent + '\n</div>\n';
            prevContent = getContent((forcePrevIcon ? 'other' : cat), data, false, 'kv-preview-thumb');
            return prevContent + zoomContent;
        },
        _previewDefault: function (file, previewId, isDisabled) {
            var self = this, $preview = self.$preview;
            if (!self.showPreview) {
                return;
            }
            var fname = file ? file.name : '', ftype = file ? file.type : '', content, size = file.size,
                caption = self.slug(fname), isError = isDisabled === true && !self.isUploadable,
                data = objUrl.createObjectURL(file);
            self._clearDefaultPreview();
            content = self._generatePreviewTemplate('other', data, fname, ftype, previewId, isError, size);
            $preview.append("\n" + content);
            self._setFrameAttr(previewId, caption, size);
            if (isDisabled === true && self.isUploadable) {
                self._setThumbStatus($('#' + previewId), 'Error');
            }
        },
        _previewFile: function (i, file, theFile, previewId, data) {
            if (!this.showPreview) {
                return;
            }
            var self = this, cat = self._parseFileType(file), fname = file ? file.name : '', caption = self.slug(fname),
                types = self.allowedPreviewTypes, mimes = self.allowedPreviewMimeTypes, $preview = self.$preview,
                chkTypes = types && types.indexOf(cat) >= 0, size = file.size,
                iData = (cat === 'text' || cat === 'html' || cat === 'image') ? theFile.target.result : data, content,
                chkMimes = mimes && mimes.indexOf(file.type) !== -1;
            /** @namespace window.DOMPurify */
            if (cat === 'html' && self.purifyHtml && window.DOMPurify) {
                iData = window.DOMPurify.sanitize(iData);
            }
            if (chkTypes || chkMimes) {
                content = self._generatePreviewTemplate(cat, iData, fname, file.type, previewId, false, size);
                self._clearDefaultPreview();
                $preview.append("\n" + content);
                self._validateImage(previewId, caption, file.type);
            } else {
                self._previewDefault(file, previewId);
            }
            self._setThumbAttr(previewId, caption, size);
            self._initSortable();
        },
        _setThumbAttr: function (id, caption, size) {
            var self = this, $frame = $('#' + id);
            if ($frame.length) {
                size = size && size > 0 ? self._getSize(size) : '';
                $frame.data({'caption': caption, 'size': size});
            }
        },
        _setInitThumbAttr: function () {
            var self = this, id = self.id, data = previewCache.data[id], len = previewCache.count(id, true), config,
                caption, size, previewId;
            if (len === 0) {
                return;
            }
            for (var i = 0; i < len; i++) {
                config = data.config[i];
                previewId = data.initId + '-' + 'init_' + i;
                caption = ifSet('caption', config, ifSet('filename', config));
                size = ifSet('size', config);
                self._setThumbAttr(previewId, caption, size);
            }
        },
        _slugDefault: function (text) {
            return isEmpty(text) ? '' : String(text).replace(/[\-\[\]\/\{}:;#%=\(\)\*\+\?\\\^\$\|<>&"']/g, '_');
        },
        _readFiles: function (files) {
            this.reader = new FileReader();
            var self = this, $el = self.$element, $preview = self.$preview, reader = self.reader,
                $container = self.$previewContainer, $status = self.$previewStatus, msgLoading = self.msgLoading,
                msgProgress = self.msgProgress, previewInitId = self.previewInitId, numFiles = files.length,
                settings = self.fileTypeSettings, ctr = self.filestack.length, readFile,
                maxPreviewSize = self.maxFilePreviewSize && parseFloat(self.maxFilePreviewSize),
                canPreview = $preview.length && (!maxPreviewSize || isNaN(maxPreviewSize)),
                throwError = function (msg, file, previewId, index) {
                    var p1 = $.extend(true, {}, self._getOutData({}, {}, files), {id: previewId, index: index}),
                        p2 = {id: previewId, index: index, file: file, files: files};
                    self._previewDefault(file, previewId, true);
                    if (self.isUploadable) {
                        self.addToStack(undefined);
                        setTimeout(function () {
                            readFile(index + 1);
                        }, 100);
                    }
                    self._initFileActions();
                    if (self.removeFromPreviewOnError) {
                        $('#' + previewId).remove();
                    }
                    return self.isUploadable ? self._showUploadError(msg, p1) : self._showError(msg, p2);
                };

            self.loadedImages = [];
            self.totalImagesCount = 0;

            $.each(files, function (key, file) {
                var func = self.fileTypeSettings.image || defaultFileTypeSettings.image;
                if (func && func(file.type)) {
                    self.totalImagesCount++;
                }
            });
            readFile = function (i) {
                if (isEmpty($el.attr('multiple'))) {
                    numFiles = 1;
                }
                if (i >= numFiles) {
                    if (self.isUploadable && self.filestack.length > 0) {
                        self._raise('filebatchselected', [self.getFileStack()]);
                    } else {
                        self._raise('filebatchselected', [files]);
                    }
                    $container.removeClass('file-thumb-loading');
                    $status.html('');
                    return;
                }
                var node = ctr + i, previewId = previewInitId + "-" + node, isText, isImage, file = files[i], fSizeKB,
                    caption = file.name ? self.slug(file.name) : '', fileSize = (file.size || 0) / 1000, checkFile,
                    fileExtExpr = '', previewData = objUrl.createObjectURL(file), fileCount = 0, j, msg, typ, chk,
                    fileTypes = self.allowedFileTypes, typ1, typ2, strTypes = '', typLen = fileTypes ? fileTypes.length : 0,
                    fileExt = self.allowedFileExtensions, strExt = isEmpty(fileExt) ? '' : fileExt.join(', ');
                if (typLen > 0) {
                    for (j = 0; j < typLen; j++) {
                        typ1 = fileTypes[j];
                        typ2 = self.msgFileTypes[typ1] || typ1;
                        strTypes += j === 0 ? typ2 : ', ' + typ2;
                    }
                }
                if (caption === false) {
                    readFile(i + 1);
                    return;
                }
                if (caption.length === 0) {
                    msg = self.msgInvalidFileName.replace('{name}', htmlEncode(file.name));
                    self.isError = throwError(msg, file, previewId, i);
                    return;
                }
                if (!isEmpty(fileExt)) {
                    fileExtExpr = new RegExp('\\.(' + fileExt.join('|') + ')$', 'i');
                }
                fSizeKB = fileSize.toFixed(2);
                if (self.maxFileSize > 0 && fileSize > self.maxFileSize) {
                    msg = self.msgSizeTooLarge.replace('{name}', caption).replace('{size}', fSizeKB)
                        .replace('{maxSize}', self.maxFileSize);
                    self.isError = throwError(msg, file, previewId, i);
                    return;
                }
                if (self.minFileSize !== null && fileSize <= getNum(self.minFileSize)) {
                    msg = self.msgSizeTooSmall.replace('{name}', caption).replace('{size}', fSizeKB)
                        .replace('{minSize}', self.minFileSize);
                    self.isError = throwError(msg, file, previewId, i);
                    return;
                }
                if (!isEmpty(fileTypes) && isArray(fileTypes)) {
                    for (j = 0; j < fileTypes.length; j += 1) {
                        typ = fileTypes[j];
                        checkFile = settings[typ];
                        chk = (checkFile !== undefined && checkFile(file.type, caption));
                        fileCount += isEmpty(chk) ? 0 : chk.length;
                    }
                    if (fileCount === 0) {
                        msg = self.msgInvalidFileType.replace('{name}', caption).replace('{types}', strTypes);
                        self.isError = throwError(msg, file, previewId, i);
                        return;
                    }
                }
                if (fileCount === 0 && !isEmpty(fileExt) && isArray(fileExt) && !isEmpty(fileExtExpr)) {
                    chk = compare(caption, fileExtExpr);
                    fileCount += isEmpty(chk) ? 0 : chk.length;
                    if (fileCount === 0) {
                        msg = self.msgInvalidFileExtension.replace('{name}', caption).replace('{extensions}', strExt);
                        self.isError = throwError(msg, file, previewId, i);
                        return;
                    }
                }
                if (!self.showPreview) {
                    self.addToStack(file);
                    setTimeout(function () {
                        readFile(i + 1);
                    }, 100);
                    self._raise('fileloaded', [file, previewId, i, reader]);
                    return;
                }
                if (!canPreview && fileSize > maxPreviewSize) {
                    self.addToStack(file);
                    $container.addClass('file-thumb-loading');
                    self._previewDefault(file, previewId);
                    self._initFileActions();
                    self._updateFileDetails(numFiles);
                    readFile(i + 1);
                    return;
                }
                if ($preview.length && FileReader !== undefined) {
                    $status.html(msgLoading.replace('{index}', i + 1).replace('{files}', numFiles));
                    $container.addClass('file-thumb-loading');
                    reader.onerror = function (evt) {
                        self._errorHandler(evt, caption);
                    };
                    reader.onload = function (theFile) {
                        self._previewFile(i, file, theFile, previewId, previewData);
                        self._initFileActions();
                    };
                    reader.onloadend = function () {
                        msg = msgProgress.replace('{index}', i + 1).replace('{files}', numFiles)
                            .replace('{percent}', 50).replace('{name}', caption);
                        setTimeout(function () {
                            $status.html(msg);
                            self._updateFileDetails(numFiles);
                            readFile(i + 1);
                        }, 100);
                        self._raise('fileloaded', [file, previewId, i, reader]);
                    };
                    reader.onprogress = function (data) {
                        if (data.lengthComputable) {
                            var fact = (data.loaded / data.total) * 100, progress = Math.ceil(fact);
                            msg = msgProgress.replace('{index}', i + 1).replace('{files}', numFiles)
                                .replace('{percent}', progress).replace('{name}', caption);
                            setTimeout(function () {
                                $status.html(msg);
                            }, 100);
                        }
                    };
                    isText = ifSet('text', settings, defaultFileTypeSettings.text);
                    isImage = ifSet('image', settings, defaultFileTypeSettings.image);

                    if (isText(file.type, caption)) {
                        reader.readAsText(file, self.textEncoding);
                    } else {
                        if (isImage(file.type, caption)) {
                            reader.readAsDataURL(file);
                        } else {
                            reader.readAsArrayBuffer(file);
                        }
                    }
                } else {
                    self._previewDefault(file, previewId);
                    setTimeout(function () {
                        readFile(i + 1);
                        self._updateFileDetails(numFiles);
                    }, 100);
                    self._raise('fileloaded', [file, previewId, i, reader]);
                }
                self.addToStack(file);
            };

            readFile(0);
            self._updateFileDetails(numFiles, false);
        },
        _updateFileDetails: function (numFiles) {
            var self = this, $el = self.$element, fileStack = self.getFileStack(),
                name = (isIE(9) && findFileName($el.val())) ||
                    ($el[0].files[0] && $el[0].files[0].name) || (fileStack.length && fileStack[0].name) || '',
                label = self.slug(name), n = self.isUploadable ? fileStack.length : numFiles,
                nFiles = previewCache.count(self.id) + n, log = n > 1 ? self._getMsgSelected(nFiles) : label;
            if (self.isError) {
                self.$previewContainer.removeClass('file-thumb-loading');
                self.$previewStatus.html('');
                self.$captionContainer.find('.kv-caption-icon').hide();
            } else {
                self._showFileIcon();
            }
            self._setCaption(log, self.isError);
            self.$container.removeClass('file-input-new file-input-ajax-new');
            if (arguments.length === 1) {
                self._raise('fileselect', [numFiles, label]);
            }
            if (previewCache.count(self.id)) {
                self._initPreviewActions();
            }
        },
        _setThumbStatus: function ($thumb, status) {
            var self = this;
            if (!self.showPreview) {
                return;
            }
            var icon = 'indicator' + status, msg = icon + 'Title',
                css = 'file-preview-' + status.toLowerCase(),
                $indicator = $thumb.find('.file-upload-indicator'),
                config = self.fileActionSettings;
            $thumb.removeClass('file-preview-success file-preview-error file-preview-loading');
            if (status === 'Error') {
                $thumb.find('.kv-file-upload').attr('disabled', true);
            }
            if (status === 'Success') {
                $thumb.find('.file-drag-handle').remove();
                $indicator.css('margin-left', 0);
            }
            $indicator.html(config[icon]);
            $indicator.attr('title', config[msg]);
            $thumb.addClass(css);
        },
        _setProgressCancelled: function () {
            var self = this;
            self._setProgress(101, self.$progress, self.msgCancelled);
        },
        _setProgress: function (p, $el, error) {
            var self = this, pct = Math.min(p, 100), template = pct < 100 ? self.progressTemplate :
                    (error ? self.progressErrorTemplate : (p <= 100 ? self.progressTemplate : self.progressCompleteTemplate)),
                pctLimit = self.progressUploadThreshold;
            $el = $el || self.$progress;
            if (!isEmpty(template)) {
                if (pctLimit && pct > pctLimit && p <= 100) {
                    var out = template.replace('{percent}', pctLimit).replace('{percent}', pctLimit).replace('{percent}%', self.msgUploadThreshold);
                    $el.html(out);
                } else {
                    $el.html(template.replace(/\{percent}/g, pct));
                }
                if (error) {
                    $el.find('[role="progressbar"]').html(error);
                }
            }
        },
        _setFileDropZoneTitle: function () {
            var self = this, $zone = self.$container.find('.file-drop-zone'), title = self.dropZoneTitle, strFiles;
            if (self.isClickable) {
                strFiles = isEmpty(self.$element.attr('multiple')) ? self.fileSingle : self.filePlural;
                title += self.dropZoneClickTitle.replace('{files}', strFiles);
            }
            $zone.find('.' + self.dropZoneTitleClass).remove();
            if (!self.isUploadable || !self.showPreview || $zone.length === 0 || self.getFileStack().length > 0 || !self.dropZoneEnabled) {
                return;
            }
            if ($zone.find(FRAMES).length === 0 && isEmpty(self.defaultPreviewContent)) {
                $zone.prepend('<div class="' + self.dropZoneTitleClass + '">' + title + '</div>');
            }
            self.$container.removeClass('file-input-new');
            addCss(self.$container, 'file-input-ajax-new');
        },
        _setAsyncUploadStatus: function (previewId, pct, total) {
            var self = this, sum = 0;
            self._setProgress(pct, $('#' + previewId).find('.file-thumb-progress'));
            self.uploadStatus[previewId] = pct;
            $.each(self.uploadStatus, function (key, value) {
                sum += value;
            });
            self._setProgress(Math.floor(sum / total));

        },
        _validateMinCount: function () {
            var self = this, len = self.isUploadable ? self.getFileStack().length : self.$element.get(0).files.length;
            if (self.validateInitialCount && self.minFileCount > 0 && self._getFileCount(len - 1) < self.minFileCount) {
                self._noFilesError({});
                return false;
            }
            return true;
        },
        _getFileCount: function (fileCount) {
            var self = this, addCount = 0;
            if (self.validateInitialCount && !self.overwriteInitial) {
                addCount = previewCache.count(self.id);
                fileCount += addCount;
            }
            return fileCount;
        },
        _getFileName: function (file) {
            return file && file.name ? this.slug(file.name) : undefined;
        },
        _getFileNames: function (skipNull) {
            var self = this;
            return self.filenames.filter(function (n) {
                return (skipNull ? n !== undefined : n !== undefined && n !== null);
            });
        },
        _setPreviewError: function ($thumb, i, val) {
            var self = this;
            if (i !== undefined) {
                self.updateStack(i, val);
            }
            if (self.removeFromPreviewOnError) {
                $thumb.remove();
            } else {
                self._setThumbStatus($thumb, 'Error');
            }
        },
        _checkDimensions: function (i, chk, $img, $thumb, fname, type, params) {
            var self = this, msg, dim, tag = chk === 'Small' ? 'min' : 'max', limit = self[tag + 'Image' + type],
                $imgEl, isValid;
            if (isEmpty(limit) || !$img.length) {
                return;
            }
            $imgEl = $img[0];
            dim = (type === 'Width') ? $imgEl.naturalWidth || $imgEl.width : $imgEl.naturalHeight || $imgEl.height;
            isValid = chk === 'Small' ? dim >= limit : dim <= limit;
            if (isValid) {
                return;
            }
            msg = self['msgImage' + type + chk].replace('{name}', fname).replace('{size}', limit);
            self._showUploadError(msg, params);
            self._setPreviewError($thumb, i, null);
        },
        _validateImage: function (previewId, fname, ftype) {
            var self = this, $preview = self.$preview, params, w1, w2, $thumb = $preview.find("#" + previewId),
                i = $thumb.attr('data-fileindex'), $img = $thumb.find('img');
            fname = fname || 'Untitled';
            if (!$img.length) {
                return;
            }
            handler($img, 'load', function () {
                w1 = $thumb.width();
                w2 = $preview.width();
                if (w1 > w2) {
                    $img.css('width', '100%');
                    $thumb.css('width', '97%');
                }
                params = {ind: i, id: previewId};
                self._checkDimensions(i, 'Small', $img, $thumb, fname, 'Width', params);
                self._checkDimensions(i, 'Small', $img, $thumb, fname, 'Height', params);
                if (!self.resizeImage) {
                    self._checkDimensions(i, 'Large', $img, $thumb, fname, 'Width', params);
                    self._checkDimensions(i, 'Large', $img, $thumb, fname, 'Height', params);
                }
                self._raise('fileimageloaded', [previewId]);
                self.loadedImages.push({ind: i, img: $img, thumb: $thumb, pid: previewId, typ: ftype});
                self._validateAllImages();
            });
        },
        _validateAllImages: function () {
            var self = this, i, config, $img, pid, ind, errFunc, ctr = {val: 0};
            if (self.loadedImages.length !== self.totalImagesCount) {
                return;
            }
            self._raise('fileimagesloaded');
            if (!self.resizeImage) {
                return;
            }
            errFunc = self.isUploadable ? self._showUploadError : self._showError;
            for (i = 0; i < self.loadedImages.length; i++) {
                config = self.loadedImages[i];
                $img = config.img;
                pid = config.pid;
                ind = config.ind;
                if (!self._getResizedImage($img[0], config.typ, pid, ind, ctr, self.loadedImages.length)) {
                    errFunc(self.msgImageResizeError, {id: pid, 'index': ind}, 'fileimageresizeerror');
                    self._setPreviewError(config.thumb, ind);
                }
            }
        },
        _getResizedImage: function (image, type, pid, ind, counter, numImgs) {
            var self = this, width = image.naturalWidth, height = image.naturalHeight, ratio = 1,
                maxWidth = self.maxImageWidth || width, maxHeight = self.maxImageHeight || height,
                isValidImage = !!(width && height), chkWidth, chkHeight, canvas = self.imageCanvas,
                context = self.imageCanvasContext;
            if (!self.filestack[ind] || !isValidImage || (width <= maxWidth && height <= maxHeight)) {
                if (isValidImage && self.filestack[ind]) {
                    self._raise('fileimageresized', [pid, ind]);
                }
                counter.val++;
                if (counter.val === numImgs) {
                    self._raise('fileimagesresized');
                }
                return isValidImage;
            }
            type = type || self.resizeDefaultImageType;
            chkWidth = width > maxWidth;
            chkHeight = height > maxHeight;
            if (self.resizePreference === 'width') {
                ratio = chkWidth ? maxWidth / width : (chkHeight ? maxHeight / height : 1);
            } else {
                ratio = chkHeight ? maxHeight / height : (chkWidth ? maxWidth / width : 1);
            }
            self._resetCanvas();
            width *= ratio;
            height *= ratio;
            canvas.width = width;
            canvas.height = height;
            try {
                context.drawImage(image, 0, 0, width, height);
                canvas.toBlob(function (blob) {
                    self.filestack[ind] = blob;
                    self._raise('fileimageresized', [pid, ind]);
                    counter.val++;
                    if (counter.val === numImgs) {
                        self._raise('fileimagesresized', [undefined, undefined]);
                    }
                }, type, self.resizeQuality);
                return true;
            }
            catch (err) {
                counter.val++;
                if (counter.val === numImgs) {
                    self._raise('fileimagesresized', [undefined, undefined]);
                }
                return false;
            }
        },
        _initBrowse: function ($container) {
            var self = this;
            if (self.showBrowse) {
                self.$btnFile = $container.find('.btn-file');
                self.$btnFile.append(self.$element);
            } else {
                self.$element.hide();
            }
        },
        _initCaption: function () {
            var self = this, cap = self.initialCaption || '';
            if (self.overwriteInitial || isEmpty(cap)) {
                self.$caption.html('');
                return false;
            }
            self._setCaption(cap);
            return true;
        },
        _setCaption: function (content, isError) {
            var self = this, title, out, n, cap, stack = self.getFileStack();
            if (!self.$caption.length) {
                return;
            }
            if (isError) {
                title = $('<div>' + self.msgValidationError + '</div>').text();
                n = stack.length;
                if (n) {
                    cap = n === 1 && stack[0] ? self._getFileNames()[0] : self._getMsgSelected(n);
                } else {
                    cap = self._getMsgSelected(self.msgNo);
                }
                out = '<span class="' + self.msgValidationErrorClass + '">' + self.msgValidationErrorIcon +
                    (isEmpty(content) ? cap : content) + '</span>';
            } else {
                if (isEmpty(content)) {
                    return;
                }
                title = $('<div>' + content + '</div>').text();
                out = self._getLayoutTemplate('fileIcon') + title;
            }
            self.$caption.html(out);
            self.$caption.attr('title', title);
            self.$captionContainer.find('.file-caption-ellipsis').attr('title', title);
        },
        _createContainer: function () {
            var self = this, $container = $(document.createElement("div"))
                .attr({"class": 'file-input file-input-new'})
                .html(self._renderMain());
            self.$element.before($container);
            self._initBrowse($container);
            if (self.theme) {
                $container.addClass('theme-' + self.theme);
            }
            return $container;
        },
        _refreshContainer: function () {
            var self = this, $container = self.$container;
            $container.before(self.$element);
            $container.html(self._renderMain());
            self._initBrowse($container);
        },
        _renderMain: function () {
            var self = this, dropCss = (self.isUploadable && self.dropZoneEnabled) ? ' file-drop-zone' : 'file-drop-disabled',
                close = !self.showClose ? '' : self._getLayoutTemplate('close'),
                preview = !self.showPreview ? '' : self._getLayoutTemplate('preview')
                    .replace(/\{class}/g, self.previewClass)
                    .replace(/\{dropClass}/g, dropCss),
                css = self.isDisabled ? self.captionClass + ' file-caption-disabled' : self.captionClass,
                caption = self.captionTemplate.replace(/\{class}/g, css + ' kv-fileinput-caption');
            return self.mainTemplate.replace(/\{class}/g, self.mainClass +
                (!self.showBrowse && self.showCaption ? ' no-browse' : ''))
                .replace(/\{preview}/g, preview)
                .replace(/\{close}/g, close)
                .replace(/\{caption}/g, caption)
                .replace(/\{upload}/g, self._renderButton('upload'))
                .replace(/\{remove}/g, self._renderButton('remove'))
                .replace(/\{cancel}/g, self._renderButton('cancel'))
                .replace(/\{browse}/g, self._renderButton('browse'));
        },
        _renderButton: function (type) {
            var self = this, tmplt = self._getLayoutTemplate('btnDefault'), css = self[type + 'Class'],
                title = self[type + 'Title'], icon = self[type + 'Icon'], label = self[type + 'Label'],
                status = self.isDisabled ? ' disabled' : '', btnType = 'button';
            switch (type) {
                case 'remove':
                    if (!self.showRemove) {
                        return '';
                    }
                    break;
                case 'cancel':
                    if (!self.showCancel) {
                        return '';
                    }
                    css += ' hide';
                    break;
                case 'upload':
                    if (!self.showUpload) {
                        return '';
                    }
                    if (self.isUploadable && !self.isDisabled) {
                        tmplt = self._getLayoutTemplate('btnLink').replace('{href}', self.uploadUrl);
                    } else {
                        btnType = 'submit';
                    }
                    break;
                case 'browse':
                    if (!self.showBrowse) {
                        return '';
                    }
                    tmplt = self._getLayoutTemplate('btnBrowse');
                    break;
                default:
                    return '';
            }

            css += type === 'browse' ? ' btn-file' : ' fileinput-' + type + ' fileinput-' + type + '-button';
            if (!isEmpty(label)) {
                label = ' <span class="' + self.buttonLabelClass + '">' + label + '</span>';
            }
            return tmplt.replace('{type}', btnType).replace('{css}', css).replace('{title}', title)
                .replace('{status}', status).replace('{icon}', icon).replace('{label}', label);
        },
        _renderThumbProgress: function () {
            return '<div class="file-thumb-progress hide">' + this.progressTemplate.replace(/\{percent}/g,
                    '0') + '</div>';
        },
        _renderFileFooter: function (caption, size, width, isError) {
            var self = this, config = self.fileActionSettings, rem = config.showRemove, drg = config.showDrag,
                upl = config.showUpload, zoom = config.showZoom, out, template = self._getLayoutTemplate('footer'),
                indicator = isError ? config.indicatorError : config.indicatorNew,
                title = isError ? config.indicatorErrorTitle : config.indicatorNewTitle;
            size = self._getSize(size);
            if (self.isUploadable) {
                out = template.replace(/\{actions}/g, self._renderFileActions(upl, rem, zoom, drg, false, false, false))
                    .replace(/\{caption}/g, caption).replace(/\{size}/g, size).replace(/\{width}/g, width)
                    .replace(/\{progress}/g, self._renderThumbProgress()).replace(/\{indicator}/g, indicator)
                    .replace(/\{indicatorTitle}/g, title);
            } else {
                out = template.replace(/\{actions}/g,
                    self._renderFileActions(false, false, zoom, drg, false, false, false))
                    .replace(/\{caption}/g, caption).replace(/\{size}/g, size).replace(/\{width}/g, width)
                    .replace(/\{progress}/g, '').replace(/\{indicator}/g, indicator)
                    .replace(/\{indicatorTitle}/g, title);
            }
            out = replaceTags(out, self.previewThumbTags);
            return out;
        },
        _renderFileActions: function (showUpload, showDelete, showZoom, showDrag, disabled, url, key, isInit) {
            if (!showUpload && !showDelete && !showZoom && !showDrag) {
                return '';
            }
            var self = this,
                vUrl = url === false ? '' : ' data-url="' + url + '"',
                vKey = key === false ? '' : ' data-key="' + key + '"',
                btnDelete = '', btnUpload = '', btnZoom = '', btnDrag = '', css,
                template = self._getLayoutTemplate('actions'), config = self.fileActionSettings,
                otherButtons = self.otherActionButtons.replace(/\{dataKey}/g, vKey),
                removeClass = disabled ? config.removeClass + ' disabled' : config.removeClass;
            if (showDelete) {
                btnDelete = self._getLayoutTemplate('actionDelete')
                    .replace(/\{removeClass}/g, removeClass)
                    .replace(/\{removeIcon}/g, config.removeIcon)
                    .replace(/\{removeTitle}/g, config.removeTitle)
                    .replace(/\{dataUrl}/g, vUrl)
                    .replace(/\{dataKey}/g, vKey);
            }
            if (showUpload) {
                btnUpload = self._getLayoutTemplate('actionUpload')
                    .replace(/\{uploadClass}/g, config.uploadClass)
                    .replace(/\{uploadIcon}/g, config.uploadIcon)
                    .replace(/\{uploadTitle}/g, config.uploadTitle);
            }
            if (showZoom) {
                btnZoom = self._getLayoutTemplate('actionZoom')
                    .replace(/\{zoomClass}/g, config.zoomClass)
                    .replace(/\{zoomIcon}/g, config.zoomIcon)
                    .replace(/\{zoomTitle}/g, config.zoomTitle);
            }
            if (showDrag && isInit) {
                css = 'drag-handle-init ' + config.dragClass;
                btnDrag = self._getLayoutTemplate('actionDrag').replace(/\{dragClass}/g, css)
                    .replace(/\{dragTitle}/g, config.dragTitle)
                    .replace(/\{dragIcon}/g, config.dragIcon);
            }
            return template.replace(/\{delete}/g, btnDelete)
                .replace(/\{upload}/g, btnUpload)
                .replace(/\{zoom}/g, btnZoom)
                .replace(/\{drag}/g, btnDrag)
                .replace(/\{other}/g, otherButtons);
        },
        _browse: function (e) {
            var self = this;
            self._raise('filebrowse');
            if (e && e.isDefaultPrevented()) {
                return;
            }
            if (self.isError && !self.isUploadable) {
                self.clear();
            }
            self.$captionContainer.focus();
        },
        _change: function (e) {
            var self = this, $el = self.$element;
            if (!self.isUploadable && isEmpty($el.val()) && self.fileInputCleared) { // IE 11 fix
                self.fileInputCleared = false;
                return;
            }
            self.fileInputCleared = false;
            var tfiles, msg, total, isDragDrop = arguments.length > 1, isAjaxUpload = self.isUploadable, i = 0, f, n, len,
                files = isDragDrop ? e.originalEvent.dataTransfer.files : $el.get(0).files, ctr = self.filestack.length,
                isSingleUpload = isEmpty($el.attr('multiple')), flagSingle = (isSingleUpload && ctr > 0), folders = 0,
                throwError = function (mesg, file, previewId, index) {
                    var p1 = $.extend(true, {}, self._getOutData({}, {}, files), {id: previewId, index: index}),
                        p2 = {id: previewId, index: index, file: file, files: files};
                    return self.isUploadable ? self._showUploadError(mesg, p1) : self._showError(mesg, p2);
                };
            self.reader = null;
            self._resetUpload();
            self._hideFileIcon();
            if (self.isUploadable) {
                self.$container.find('.file-drop-zone .' + self.dropZoneTitleClass).remove();
            }
            if (isDragDrop) {
                tfiles = [];
                while (files[i]) {
                    f = files[i];
                    if (!f.type && f.size % 4096 === 0) {
                        folders++;
                    } else {
                        tfiles.push(f);
                    }
                    i++;
                }
            } else {
                if (e.target.files === undefined) {
                    tfiles = e.target && e.target.value ? [
                        {name: e.target.value.replace(/^.+\\/, '')}
                    ] : [];
                } else {
                    tfiles = e.target.files;
                }
            }
            if (isEmpty(tfiles) || tfiles.length === 0) {
                if (!isAjaxUpload) {
                    self.clear();
                }
                self._showFolderError(folders);
                self._raise('fileselectnone');
                return;
            }
            self._resetErrors();
            len = tfiles.length;
            total = self._getFileCount(self.isUploadable ? (self.getFileStack().length + len) : len);
            if (self.maxFileCount > 0 && total > self.maxFileCount) {
                if (!self.autoReplace || len > self.maxFileCount) {
                    n = (self.autoReplace && len > self.maxFileCount) ? len : total;
                    msg = self.msgFilesTooMany.replace('{m}', self.maxFileCount).replace('{n}', n);
                    self.isError = throwError(msg, null, null, null);
                    self.$captionContainer.find('.kv-caption-icon').hide();
                    self._setCaption('', true);
                    self.$container.removeClass('file-input-new file-input-ajax-new');
                    return;
                }
                if (total > self.maxFileCount) {
                    self._resetPreviewThumbs(isAjaxUpload);
                }
            } else {
                if (!isAjaxUpload || flagSingle) {
                    self._resetPreviewThumbs(false);
                    if (flagSingle) {
                        self.clearStack();
                    }
                } else {
                    if (isAjaxUpload && ctr === 0 && (!previewCache.count(self.id) || self.overwriteInitial)) {
                        self._resetPreviewThumbs(true);
                    }
                }
            }
            if (self.isPreviewable) {
                self._readFiles(tfiles);
            } else {
                self._updateFileDetails(1);
            }
            self._showFolderError(folders);
        },
        _abort: function (params) {
            var self = this, data;
            if (self.ajaxAborted && typeof self.ajaxAborted === "object" && self.ajaxAborted.message !== undefined) {
                data = $.extend(true, {}, self._getOutData(), params);
                data.abortData = self.ajaxAborted.data || {};
                data.abortMessage = self.ajaxAborted.message;
                self.cancel();
                self._setProgress(101, self.$progress, self.msgCancelled);
                self._showUploadError(self.ajaxAborted.message, data, 'filecustomerror');
                return true;
            }
            return false;
        },
        _resetFileStack: function () {
            var self = this, i = 0, newstack = [], newnames = [];
            self._getThumbs().each(function () {
                var $thumb = $(this), ind = $thumb.attr('data-fileindex'),
                    file = self.filestack[ind];
                if (ind === -1) {
                    return;
                }
                if (file !== undefined) {
                    newstack[i] = file;
                    newnames[i] = self._getFileName(file);
                    $thumb.attr({
                        'id': self.previewInitId + '-' + i,
                        'data-fileindex': i
                    });
                    i++;
                } else {
                    $thumb.attr({
                        'id': 'uploaded-' + uniqId(),
                        'data-fileindex': '-1'
                    });
                }
            });
            self.filestack = newstack;
            self.filenames = newnames;
        },
        clearStack: function () {
            var self = this;
            self.filestack = [];
            self.filenames = [];
            return self.$element;
        },
        updateStack: function (i, file) {
            var self = this;
            self.filestack[i] = file;
            self.filenames[i] = self._getFileName(file);
            return self.$element;
        },
        addToStack: function (file) {
            var self = this;
            self.filestack.push(file);
            self.filenames.push(self._getFileName(file));
            return self.$element;
        },
        getFileStack: function (skipNull) {
            var self = this;
            return self.filestack.filter(function (n) {
                return (skipNull ? n !== undefined : n !== undefined && n !== null);
            });
        },
        getFilesCount: function () {
            var self = this, len = self.isUploadable ? self.getFileStack().length : self.$element.get(0).files.length;
            return self._getFileCount(len);
        },
        lock: function () {
            var self = this;
            self._resetErrors();
            self.disable();
            if (self.showRemove) {
                addCss(self.$container.find('.fileinput-remove'), 'hide');
            }
            if (self.showCancel) {
                self.$container.find('.fileinput-cancel').removeClass('hide');
            }
            self._raise('filelock', [self.filestack, self._getExtraData()]);
            return self.$element;
        },
        unlock: function (reset) {
            var self = this;
            if (reset === undefined) {
                reset = true;
            }
            self.enable();
            if (self.showCancel) {
                addCss(self.$container.find('.fileinput-cancel'), 'hide');
            }
            if (self.showRemove) {
                self.$container.find('.fileinput-remove').removeClass('hide');
            }
            if (reset) {
                self._resetFileStack();
            }
            self._raise('fileunlock', [self.filestack, self._getExtraData()]);
            return self.$element;
        },
        cancel: function () {
            var self = this, xhr = self.ajaxRequests, len = xhr.length, i;
            if (len > 0) {
                for (i = 0; i < len; i += 1) {
                    self.cancelling = true;
                    xhr[i].abort();
                }
            }
            self._setProgressCancelled();
            self._getThumbs().each(function () {
                var $thumb = $(this), ind = $thumb.attr('data-fileindex');
                $thumb.removeClass('file-uploading');
                if (self.filestack[ind] !== undefined) {
                    $thumb.find('.kv-file-upload').removeClass('disabled').removeAttr('disabled');
                    $thumb.find('.kv-file-remove').removeClass('disabled').removeAttr('disabled');
                }
                self.unlock();
            });
            return self.$element;
        },
        clear: function () {
            var self = this, cap;
            self.$btnUpload.removeAttr('disabled');
            self._getThumbs().find('video,audio,img').each(function () {
                cleanMemory($(this));
            });
            self._resetUpload();
            self.clearStack();
            self._clearFileInput();
            self._resetErrors(true);
            self._raise('fileclear');
            if (self._hasInitialPreview()) {
                self._showFileIcon();
                self._resetPreview();
                self._initPreviewActions();
                self.$container.removeClass('file-input-new');
            } else {
                self._getThumbs().each(function () {
                    self._clearObjects($(this));
                });
                if (self.isUploadable) {
                    previewCache.data[self.id] = {};
                }
                self.$preview.html('');
                cap = (!self.overwriteInitial && self.initialCaption.length > 0) ? self.initialCaption : '';
                self.$caption.html(cap);
                self.$caption.attr('title', '');
                addCss(self.$container, 'file-input-new');
                self._validateDefaultPreview();
            }
            if (self.$container.find(FRAMES).length === 0) {
                if (!self._initCaption()) {
                    self.$captionContainer.find('.kv-caption-icon').hide();
                }
            }
            self._hideFileIcon();
            self._raise('filecleared');
            self.$captionContainer.focus();
            self._setFileDropZoneTitle();
            return self.$element;
        },
        reset: function () {
            var self = this;
            self._resetPreview();
            self.$container.find('.fileinput-filename').text('');
            self._raise('filereset');
            addCss(self.$container, 'file-input-new');
            if (self.$preview.find(FRAMES).length || self.isUploadable && self.dropZoneEnabled) {
                self.$container.removeClass('file-input-new');
            }
            self._setFileDropZoneTitle();
            self.clearStack();
            self.formdata = {};
            return self.$element;
        },
        disable: function () {
            var self = this;
            self.isDisabled = true;
            self._raise('filedisabled');
            self.$element.attr('disabled', 'disabled');
            self.$container.find(".kv-fileinput-caption").addClass("file-caption-disabled");
            self.$container.find(".btn-file, .fileinput-remove, .fileinput-upload, .file-preview-frame button").attr(
                "disabled",
                true);
            self._initDragDrop();
            return self.$element;
        },
        enable: function () {
            var self = this;
            self.isDisabled = false;
            self._raise('fileenabled');
            self.$element.removeAttr('disabled');
            self.$container.find(".kv-fileinput-caption").removeClass("file-caption-disabled");
            self.$container.find(
                ".btn-file, .fileinput-remove, .fileinput-upload, .file-preview-frame button").removeAttr("disabled");
            self._initDragDrop();
            return self.$element;
        },
        upload: function () {
            var self = this, totLen = self.getFileStack().length, params = {}, i, outData, len,
                hasExtraData = !$.isEmptyObject(self._getExtraData());
            if (!self.isUploadable || self.isDisabled) {
                return;
            }
            if (self.minFileCount > 0 && self._getFileCount(totLen) < self.minFileCount) {
                self._noFilesError(params);
                return;
            }
            if (totLen === 0 && !hasExtraData) {
                self._resetUpload();
                self._showUploadError(self.msgUploadEmpty);
                return;
            }
            self._resetUpload();
            self.$progress.removeClass('hide');
            self.uploadCount = 0;
            self.uploadStatus = {};
            self.uploadLog = [];
            self.lock();
            self._setProgress(2);
            if (totLen === 0 && hasExtraData) {
                self._uploadExtraOnly();
                return;
            }
            len = self.filestack.length;
            self.hasInitData = false;
            if (self.uploadAsync) {
                outData = self._getOutData();
                self._raise('filebatchpreupload', [outData]);
                self.fileBatchCompleted = false;
                self.uploadCache = {content: [], config: [], tags: [], append: true};
                self.uploadAsyncCount = self.getFileStack().length;
                for (i = 0; i < len; i++) {
                    self.uploadCache.content[i] = null;
                    self.uploadCache.config[i] = null;
                    self.uploadCache.tags[i] = null;
                }
                self.$preview.find('.file-preview-initial').removeClass(SORT_CSS);
                self._initSortable();
                self.cacheInitialPreview = {
                    content: self.initialPreview,
                    config: self.initialPreviewConfig,
                    tags: self.initialPreviewThumbTags
                };
                for (i = 0; i < len; i++) {
                    if (self.filestack[i] !== undefined) {
                        self._uploadSingle(i, self.filestack, true);
                    }
                }
                return;
            }
            self._uploadBatch();
            return self.$element;
        },
        destroy: function () {
            var self = this, $cont = self.$container;
            $cont.find('.file-drop-zone').off();
            self.$element.insertBefore($cont).off(NAMESPACE).removeData();
            $cont.off().remove();
            return self.$element;
        },
        refresh: function (options) {
            var self = this, $el = self.$element;
            options = options ? $.extend(true, {}, self.options, options) : self.options;
            self.destroy();
            $el.fileinput(options);
            if ($el.val()) {
                $el.trigger('change.fileinput');
            }
            return $el;
        }
    };

    $.fn.fileinput = function (option) {
        if (!hasFileAPISupport() && !isIE(9)) {
            return;
        }
        var args = Array.apply(null, arguments), retvals = [];
        args.shift();
        this.each(function () {
            var self = $(this), data = self.data('fileinput'), options = typeof option === 'object' && option,
                theme = options.theme || self.data('theme'), l = {}, t = {},
                lang = options.language || self.data('language') || $.fn.fileinput.defaults.language || 'en', opts;
            if (!data) {
                if (theme) {
                    t = $.fn.fileinputThemes[theme] || {};
                }
                if (lang !== 'en' && !isEmpty($.fn.fileinputLocales[lang])) {
                    l = $.fn.fileinputLocales[lang] || {};
                }
                opts = $.extend(true, {}, $.fn.fileinput.defaults, t, $.fn.fileinputLocales.en, l, options,
                    self.data());
                data = new FileInput(this, opts);
                self.data('fileinput', data);
            }

            if (typeof option === 'string') {
                retvals.push(data[option].apply(data, args));
            }
        });
        switch (retvals.length) {
            case 0:
                return this;
            case 1:
                return retvals[0];
            default:
                return retvals;
        }
    };

    $.fn.fileinput.defaults = {
        language: 'en',
        showCaption: true,
        showBrowse: true,
        showPreview: true,
        showRemove: true,
        showUpload: true,
        showCancel: true,
        showClose: true,
        showUploadedThumbs: true,
        browseOnZoneClick: false,
        autoReplace: false,
        previewClass: '',
        captionClass: '',
        mainClass: 'file-caption-main',
        mainTemplate: null,
        purifyHtml: true,
        fileSizeGetter: null,
        initialCaption: '',
        initialPreview: [],
        initialPreviewDelimiter: '*$$*',
        initialPreviewAsData: false,
        initialPreviewFileType: 'image',
        initialPreviewConfig: [],
        initialPreviewThumbTags: [],
        previewThumbTags: {},
        initialPreviewShowDelete: true,
        removeFromPreviewOnError: false,
        deleteUrl: '',
        deleteExtraData: {},
        overwriteInitial: true,
        layoutTemplates: defaultLayoutTemplates,
        previewTemplates: defaultPreviewTemplates,
        previewZoomSettings: defaultPreviewZoomSettings,
        previewZoomButtonIcons: {
            prev: '<i class="glyphicon glyphicon-triangle-left"></i>',
            next: '<i class="glyphicon glyphicon-triangle-right"></i>',
            toggleheader: '<i class="glyphicon glyphicon-resize-vertical"></i>',
            fullscreen: '<i class="glyphicon glyphicon-fullscreen"></i>',
            borderless: '<i class="glyphicon glyphicon-resize-full"></i>',
            close: '<i class="glyphicon glyphicon-remove"></i>'
        },
        previewZoomButtonClasses: {
            prev: 'btn btn-navigate',
            next: 'btn btn-navigate',
            toggleheader: 'btn btn-default btn-header-toggle',
            fullscreen: 'btn btn-default',
            borderless: 'btn btn-default',
            close: 'btn btn-default'
        },
        preferIconicPreview: false,
        preferIconicZoomPreview: false,
        allowedPreviewTypes: undefined,
        allowedPreviewMimeTypes: null,
        allowedFileTypes: null,
        allowedFileExtensions: null,
        defaultPreviewContent: null,
        customLayoutTags: {},
        customPreviewTags: {},
        previewSettings: defaultPreviewSettings,
        fileTypeSettings: defaultFileTypeSettings,
        previewFileIcon: '<i class="glyphicon glyphicon-file"></i>',
        previewFileIconClass: 'file-other-icon',
        previewFileIconSettings: {},
        previewFileExtSettings: {},
        buttonLabelClass: 'hidden-xs',
        browseIcon: '<i class="glyphicon glyphicon-folder-open"></i>&nbsp;',
        browseClass: 'btn btn-primary',
        removeIcon: '<i class="glyphicon glyphicon-trash"></i>',
        removeClass: 'btn btn-default',
        cancelIcon: '<i class="glyphicon glyphicon-ban-circle"></i>',
        cancelClass: 'btn btn-default',
        uploadIcon: '<i class="glyphicon glyphicon-upload"></i>',
        uploadClass: 'btn btn-default',
        uploadUrl: null,
        uploadAsync: true,
        uploadExtraData: {},
        zoomModalHeight: 480,
        minImageWidth: null,
        minImageHeight: null,
        maxImageWidth: null,
        maxImageHeight: null,
        resizeImage: false,
        resizePreference: 'width',
        resizeQuality: 0.92,
        resizeDefaultImageType: 'image/jpeg',
        minFileSize: 0,
        maxFileSize: 0,
        maxFilePreviewSize: 25600, // 25 MB
        minFileCount: 0,
        maxFileCount: 0,
        validateInitialCount: false,
        msgValidationErrorClass: 'text-danger',
        msgValidationErrorIcon: '<i class="glyphicon glyphicon-exclamation-sign"></i> ',
        msgErrorClass: 'file-error-message',
        progressThumbClass: "progress-bar progress-bar-success progress-bar-striped active",
        progressClass: "progress-bar progress-bar-success progress-bar-striped active",
        progressCompleteClass: "progress-bar progress-bar-success",
        progressErrorClass: "progress-bar progress-bar-danger",
        progressUploadThreshold: 99,
        previewFileType: 'image',
        elCaptionContainer: null,
        elCaptionText: null,
        elPreviewContainer: null,
        elPreviewImage: null,
        elPreviewStatus: null,
        elErrorContainer: null,
        errorCloseButton: '<span class="close kv-error-close">&times;</span>',
        slugCallback: null,
        dropZoneEnabled: true,
        dropZoneTitleClass: 'file-drop-zone-title',
        fileActionSettings: {},
        otherActionButtons: '',
        textEncoding: 'UTF-8',
        ajaxSettings: {},
        ajaxDeleteSettings: {},
        showAjaxErrorDetails: true
    };

    $.fn.fileinputLocales.en = {
        fileSingle: 'file',
        filePlural: 'files',
        browseLabel: 'Browse &hellip;',
        removeLabel: 'Remove',
        removeTitle: 'Clear selected files',
        cancelLabel: 'Cancel',
        cancelTitle: 'Abort ongoing upload',
        uploadLabel: 'Upload',
        uploadTitle: 'Upload selected files',
        msgNo: 'No',
        msgNoFilesSelected: 'No files selected',
        msgCancelled: 'Cancelled',
        msgZoomModalHeading: 'Detailed Preview',
        msgSizeTooSmall: 'File "{name}" (<b>{size} KB</b>) is too small and must be larger than <b>{minSize} KB</b>.',
        msgSizeTooLarge: 'File "{name}" (<b>{size} KB</b>) exceeds maximum allowed upload size of <b>{maxSize} KB</b>.',
        msgFilesTooLess: 'You must select at least <b>{n}</b> {files} to upload.',
        msgFilesTooMany: 'Number of files selected for upload <b>({n})</b> exceeds maximum allowed limit of <b>{m}</b>.',
        msgFileNotFound: 'File "{name}" not found!',
        msgFileSecured: 'Security restrictions prevent reading the file "{name}".',
        msgFileNotReadable: 'File "{name}" is not readable.',
        msgFilePreviewAborted: 'File preview aborted for "{name}".',
        msgFilePreviewError: 'An error occurred while reading the file "{name}".',
        msgInvalidFileName: 'Invalid or unsupported characters in file name "{name}".',
        msgInvalidFileType: 'Invalid type for file "{name}". Only "{types}" files are supported.',
        msgInvalidFileExtension: 'Invalid extension for file "{name}". Only "{extensions}" files are supported.',
        msgFileTypes: {
            'image': 'image',
            'html': 'HTML',
            'text': 'text',
            'video': 'video',
            'audio': 'audio',
            'flash': 'flash',
            'pdf': 'PDF',
            'object': 'object'
        },
        msgUploadAborted: 'The file upload was aborted',
        msgUploadThreshold: 'Processing...',
        msgUploadEmpty: 'No valid data available for upload.',
        msgValidationError: 'Validation Error',
        msgLoading: 'Loading file {index} of {files} &hellip;',
        msgProgress: 'Loading file {index} of {files} - {name} - {percent}% completed.',
        msgSelected: '{n} {files} selected',
        msgFoldersNotAllowed: 'Drag & drop files only! {n} folder(s) dropped were skipped.',
        msgImageWidthSmall: 'Width of image file "{name}" must be at least {size} px.',
        msgImageHeightSmall: 'Height of image file "{name}" must be at least {size} px.',
        msgImageWidthLarge: 'Width of image file "{name}" cannot exceed {size} px.',
        msgImageHeightLarge: 'Height of image file "{name}" cannot exceed {size} px.',
        msgImageResizeError: 'Could not get the image dimensions to resize.',
        msgImageResizeException: 'Error while resizing the image.<pre>{errors}</pre>',
        dropZoneTitle: 'Drag & drop files here &hellip;',
        dropZoneClickTitle: '<br>(or click to select {files})',
        previewZoomButtonTitles: {
            prev: 'View previous file',
            next: 'View next file',
            toggleheader: 'Toggle header',
            fullscreen: 'Toggle full screen',
            borderless: 'Toggle borderless mode',
            close: 'Close detailed preview'
        }
    };

    $.fn.fileinput.Constructor = FileInput;

    /**
     * Convert automatically file inputs with class 'file' into a bootstrap fileinput control.
     */
    $(document).ready(function () {
        var $input = $('input.file[type=file]');
        if ($input.length) {
            $input.fileinput();
        }
    });
}));